1

Seattle Underground City

Did you know the remnants of Seattle's original streets are still accessible? Beneath the bustling streets of modern-day Seattle lies the Underground City , a network of subterranean passageways that formed the ground level in the 1800s.

By the end of the 19th century, after the Great Seattle Fire, it was decided to rebuild the city at a higher elevation to combat frequent flooding . So, these original streets, sidewalks, and storefronts were buried, and with it, much of their history.

Guided tours take people through tunnels and ladders and retell real and eerie stories about the history of the Underground City.

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Luray Caverns

Image: Robert Thiemann

Have you ever heard of the underground Stalacpipe Organ ? Not only is it a one-of-a-kind interaction between keyboards and cavern stalactites, but it is also the largest musical instrument in the world, according to Guinness World Records.

This instrument lives in the Luray Caverns, Virginia. It consists of an electric console that taps on these ancient stalactites of varying sizes to produce musical tones. A subterranean wonder, these caverns are also known for their extraordinary size , housing towering stalactites and stalagmites, mirrored pools, and delicate drapery-like calcite formations.

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The Underground Gardens of Baldassare Forestiere

Image: Adrian Botica

This stunning subterranean retreat was built entirely by hand. Tucked under the sun-scorched landscape of Fresno, California, lie the Underground Gardens of Baldassare Forestiere . They are the life’s work of Baldassare Forestiere, a Sicilian immigrant who started digging in the early 1900s to escape the Central Valley's oppressive heat.

Over 40 years, drawing inspiration from ancient Roman catacombs , Forestiere carved an elaborate network of underground rooms, passageways, grottoes, and courtyards that span 10 acres.

A unique masterpiece, the gardens are open with guided tours that lead guests through beautifully designed spaces featuring skylights, arches, and alcoves. This oasis also boasts an array of fruit trees, including citrus, figs, and olives.

4

Ruby Falls

Image: Goodfreephotos_com

Colorful and breathtaking, the Ruby Falls is a geological wonder located inside Lookout Mountain near Chattanooga, Tennessee.

Hidden over 1,000 feet below the mountain's surface, this waterfall cascades 145 feet into a pool , making it one of the tallest underground waterfalls open to the public.

Visitors enter the mountain and descend via elevator. Then, they walk through stunning cave formations such as stalactites, stalagmites, and flowstone. At the waterfall chamber, multicolored lights –powered by renewable energy– illuminate the falls. Lantern-lit tours are also offered as a chance to visit the marvel with a different charm.

5

The Catacombs of Green-Wood Cemetery

Image: Joy Ernst

Arched tunnels of tranquil, sacred vaults lie beneath the Green-Wood Cemetery in Brooklyn, New York. Built in the mid-19th century, these catacombs were designed as a prestigious resting place for the city’s elite , prominent families.

While the catacombs are typically closed to the public, special events are sometimes organized to welcome visitors, such as art expositions, guided history tours, and candlelit tours seasoned with live music and storytelling.

Outside, where the sun does reach, await the serene landscapes and remarkable monuments of the cemetery, which is itself a National Historic Landmark .

6

The Lost Sea

Image: Roberto Nickson

The largest underground lake in America is in Tennessee. Hidden within the Craighead Caverns in Sweetwater, this enormous body of water lies in a cave system filled with fascinating formations, such as stalactites, stalagmites, and rare anthodites, also known as "cave flowers."

A National Natural Landmark, this lake marvels scientists, who are yet unaware of the exact extension of its waters. Those who visit can embark on a boat ride called "The Lost Sea Adventure," first walking inside the cavern before reaching a boat to navigate these ethereal sights.

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Mammoth Cave National Park

Image: Sherin Jacob

The Mammoth Cave National Park is home to the longest cave system in the world . Located in central Kentucky, it extends over 420 miles of explored passages and many more likely undiscovered. Enormous chambers, underground rivers, a labyrinth of tunnels, and gypsum crystal formations can all be found at this site.

The park has been declared a UNESCO World Heritage Site and an International Biosphere Reserve. It also includes over 52,000 acres of protected land on the surface, renowned for its lush forests and diverse wildlife.

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Carlsbad Caverns National Park

Image: Cason Asher

A large bat colony lives in the Carlsbad Caverns National Park in New Mexico, but that’s not its only charm. The park boasts over 100 caves, with its centerpiece being the immense Carlsbad Cavern.

The cavern includes the Big Room, one of the largest underground chambers in North America, spanning 8.2 acres. Visitors can descend via an emblematic natural entrance or by elevator, dropping 750 feet underground. Stalactite formations like the Giant Dome, the Hall of the White Giant, and the Chandelier are some of the caves' breathtaking highlights.

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Indian Echo Caverns

Image: Magda Ehlers

The Indian Echo Caverns, which have been open to the public since the early 1920s, are carved into the limestone of the Appalachian Mountains. Located near Hummelstown, Pennsylvania, this site gets its name from the echoes heard within the cavern’s chambers , which were once believed to be mystical by Native American people in the area.

Unique, immersive sections of the caverns have names like the "Crystal Palace," the "Echo Room," and the "Wedding Room," where, yes, real weddings are sometimes held!

10

Wind Cave National Park

Image: Francesco Ungaro

Wind Cave National Park, located in the Black Hills of South Dakota, is one of the world’s largest caves, but that’s not what it’s most famous for. One signature sight here is the boxwork formation , a rare lattice-like pattern formed by calcite deposits.

The cave system stretches for over 140 miles, though much of it remains unexplored. Popular tours take guests through captivating features like the "Ribbon Room" and the "Crystal Palace."

Why is Wind Cave called that? Mainly due to the "wind" phenomenon that occurs at its entrance. The cave's air pressure causes the entrance to draw in or expel air, depending on atmospheric conditions.

1

The Crossing (2000)

Image: Emanuel Leutze, CC0, via Wikimedia Commons

Of course, there had to be a film that reflected at least a small portion of the extensive political and military life of the first president of the United States. The Crossing focuses on the famous Delaware River mission commanded by Washington, a surprise attack against the British that would definitively change the course of the Revolutionary War.

Jeff Daniels' superb performance expertly captures George Washington's bravery and sense of duty, especially in relation to the patriotic vision that drove him to lead America’s independence.

2

Thirteen Days (2000)

Image: Cecil W. Stoughton, Public domain, via Wikimedia Commons

This historical political thriller dramatizes the intense 13 days during the Cuban Missile Crisis in October 1962. The film captures John F. Kennedy’s strategic mind and leadership qualities as he navigates diplomatic and military dilemmas to avert a nuclear war with the Soviet Union.

Starring Bruce Greenwood, Thirteen Days showcases a president under immense pressure steering the United States through one of the toughest moments of the Cold War. Greenwood’s nuanced portrayal of Kennedy’s resolve, fear, and commitment to peace offers a riveting glimpse into the decision-making process inside the White House during a pivotal moment in history.

3

Truman (1995)

Image: Greta Kempton, Public domain, via Wikimedia Commons

This portrayal of Harry S. Truman is a masterful take on an often underestimated president who led our country through the end of World War II and the first years of the Cold War.

In the role of Truman, Gary Sinise effectively captures the 33rd president’s ascent from a modest background to the highest office. Sinise embodies Truman’s integrity and willpower, while bringing up his pragmatic approach to governance, which earned him a well-deserved Golden Globe.

4

The Special Relationship (2010)

Image: Ralph Alswang White House Photograph Office, Public domain, via Wikimedia Commons

The special relationship traces Bill Clinton’s interactions with British Prime Minister Tony Blair between 1997 and 2001, offering viewers front-row insight on power dynamics, how friendship develops in high-level governance, and its impact on global affairs.

Dennis Quaid brings to life the former president’s multifaceted persona, shedding light on his vulnerabilities. He perfectly nails not only Bill Clinton’s magnetic charm but also his ability to navigate complicated political landscapes and balance diplomacy with personal connections.

5

Hyde Park on Hudson (2012)

Image: National Archives and Records Administration, Public domain, via Wikimedia Commons

This historical drama depicts Franklin D. Roosevelt’s personal life and the complexities of leadership during a weekend visit by the King and Queen of England. Hyde Park on Hudson navigates through the 32nd president’s intimate relationships within his inner circle while working on strengthening the US-UK alliance on the eve of World War II.

Primarily known for his comedic genius, Bill Murray’s portrayal of Roosevelt reveals a lesser-seen side of the former president. Murray manages to capture his charm, wit, and burdens of leadership with a subtle performance blending the president’s public persona with his private vulnerabilities.

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W. (2008)

Image: d

Oliver Stone’s W. explores George W. Bush’s journey from his early tumultuous years to his tenure in the White House. The film delves into his motivations, decisions regarding the Iraq war, and his personal and political challenges.

Josh Brolin successfully embodies Bush’s distinctive mannerisms, speech patterns, and the dynamics of his relationships with his family and advisers. The actor’s take is critical yet empathetic, providing insight into the former president’s character without caricature, and offering a deeper understanding of the man behind the president.

7

All the Way (2016)

Image: Cecil Stoughton, White House Press Office (WHPO), Public domain, via Wikimedia Commons

This TV biographical drama focuses on Lyndon B. Johnson’s efforts to pass the Civil Rights Act during his first year in office, while showcasing his persuasive tactics, political dexterity, and the moral challenges he had to deal with.

Bryan Cranston remarkably captures a leader committed to transformative social change who is, at the same time, burdened by the legacy of his predecessor, John F. Kennedy. His embodiment of Johnson’s larger-than-life personality, along with conveying intimate moments of vulnerability, earned Cranston much critical acclaim for bringing humanity to one of America’s most consequential figures.

8

Frost/Nixon (2008)

Image: Robert D. Ward, Public domain, via Wikimedia Commons

Centered around a series of televised interviews between Richard Nixon and British talk show host David Frost, this riveting film showcases a battle of wits and wills. Directed by Ron Howard, Frost/Nixon offers a deeply human look at an isolated president struggling with the consequences of his actions.

Frank Langella plays Nixon in the aftermath of his resignation, as he attempts to salvage his legacy while grappling with the guilt and shame of his downfall. Langella’s masterful depiction of one of America’s most controversial figures goes beyond impersonation, which earned the actor an Academy Award nomination.

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Amistad (1997)

Image: Mathew Benjamin Brady, Public domain, via Wikimedia Commons

Steven Spielberg’s Amistad revolves around John Quincy Adams’ role as an attorney defending African men who revolted aboard a Spanish slaveship. The legendary Anthony Hopkins portrays Adam’s passionate arguments before the Supreme Court and reveals his commitment to justice and equality.

Hopkins also compellingly conveys Adam’s intelligence, determination, and the weight his legacy as both a former president and a champion of the abolitionist cause represented for him.

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Lincoln (2012)

Image: George Peter Alexander Healy, Public domain, via Wikimedia Commons

Focused on the final moments of Abraham Lincoln’s life, Steven Spielberg’s biopic highlights the 16th president’s efforts to pass the 13th Amendment, abolishing slavery.

The talented Daniel Day-Lewis delivers an absolutely iconic performance as Lincoln. He embodies the former president’s physicality and voice with such authenticity that viewers are transported to the heart of 19th-century American politics. Day-Lewis also manages to perfectly blend the president’s moral gravity, political savvy, and personal turmoil. His commitment to the role is so evident that it earned him an Oscar for Best Actor.

1

The horse diaper

Image: Lucia Macedo

Designed to catch manure in crowded cities—a problem once so severe that it shaped public infrastructure as well as the entrances to houses—the horse diaper was an invention meant to be strapped beneath working horses pulling carts and carriages.

The idea was to reduce disease and street filth during the horse-powered urban era. While the device saw limited use before automobiles rapidly replaced horses, similar designs are still occasionally used in modern veterinary practice.

2

The baby cage

Image: Taylor Flowe

Built as wire cages attached to apartment windows, so-called "baby cages" allowed infants to get fresh air when outdoor space was unavailable. Some models were guaranteed to safely hold over 30 pounds.

While alarming today and ultimately abandoned due to obvious safety concerns, the designs likely inspired some of the baby-proofing nets used today.

3

The pneumatic subway

Image: Eddi Aguirre

In the late 1860s, American entrepreneur and inventor Alfred Ely Beach set out to prove the feasibility of a human-sized pneumatic subway system beneath New York City, capable of moving both people and cargo using nothing more than air pressure.

The prototype was set up as a public attraction and carried passengers along a tunnel just over 300 feet long, from a station to a dead end. Despite its initial success, bureaucratic obstacles and high costs halted expansion, leaving it as a functional but largely forgotten underground experiment.

4

The mechanical horse

Image: Gabriel Tovar

Created for exercise and riding practice, the mechanical horse used a system of gears, cranks, and pedals to simulate walking and trotting motions while the rider sat in a saddle-like seat. It was marketed to urban riders and cavalry trainees who lacked access to stables or live horses.

Though bulky and impractical for widespread use, the device anticipated modern fitness machines by replicating real-world movements for conditioning and skill retention, rather than simple repetitive exercise.

5

The first metal detector

Image: Fer Troulik

After a failed assassination attempt on President James Garfield, Alexander Graham Bell hastily built an early metal detector in an effort to locate the bullet lodged in his body. The device functioned as intended, but it was unable to find the bullet because metal bed springs interfered with the signal.

Despite this setback, Bell’s early design proved the concept and directly influenced the development of modern metal detectors.

6

The pet-powered butter churn

Image: Matt Bero

In an inventive twist on animal-powered machinery, some 19th-century American farmers rigged small treadwheels for dogs, cats, or even goats to generate kinetic energy for churning butter. The animal ran inside the wheel, turning a rope or pulley connected to the churn.

While technically functional, the system was limited by the animal's willingness to cooperate and the small amount of power it generated.

7

The umbrella hat

Image: Claudio Schwarz

Robert W. Patten, often called the "Umbrella Man," patented one of the first commercially successful hands-free umbrella hats. It strapped a small umbrella directly to the wearer’s head, providing both sun and rain protection while keeping the hands free for work or walking.

His original design even included a mosquito net attached to the canopy. Patten didn’t enjoy much commercial success but became somewhat of an eccentric and comical popular figure, partly due to a series of comics that were inspired by his unusual invention.

8

The one-wheel motorcycle

Image: CJ Toscano

In 1971, American inventor Kerry McLean built and refined a monowheel—a one‑wheeled motorized vehicle in which the rider and engine sit inside the wheel’s circumference.

Since then, various attempts have been made to build on his original design, but it remains a niche vehicle used primarily for entertainment rather than practicality, as riders must be highly skilled simply to turn or even stay upright.

9

The first talking doll

Image: Holly Ward

In 1890, Thomas Edison embedded miniature versions of one of his most popular inventions —the phonograph—inside dolls so they could recite nursery rhymes.

While the idea was innovative, the technology was not yet there. The recordings were fragile, distorted, and often failed to work properly. The dolls were pulled from the market within weeks due to customer complaints, making it one of Edison’s rare commercial failures.

10

The glass harmonica

Image: Francesco Bovolin

Faithful to his eccentricity and inventive spirit, Benjamin Franklin redesigned the existing glass harp into a rotating spindle of glass bowls, played by touching the spinning rims with wet fingers, which he called the "glass harmonica."

The instrument produced eerie, sustained tones unlike anything else of its era. However, its fragile nature made it somewhat impractical, and the rotating mechanism posed a potential danger to the player if anything went wrong.