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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.

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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.

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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 .

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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!

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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.

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Philadelphia: Jawn

Meaning: used as a placeholder for a noun.

When in Rome, do as the Romans do. When in Philly, be aware that the word jawn can and will be used in every sentence, no matter if the jawn in question is a thing, person, event, or place. If it’s a noun, it can be jawn’ed.

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New England: Grinder

Meaning: a sub sandwich.

Subs must be one of the most widely known American sandwiches, and rightfully so. Its possibilities when it comes to fillings are seemingly endless, no matter your personal tastes. But you must consider that not every sub is called a sub. If you are passing through New England and fancy a sandwich, looking for a grinder will get you there quicker.

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Midwest: Schnockered/ Schnookered

Meaning: Schnockered: wasted/ Schnookered: scammed

Is there a connection between excessive alcohol consumption and being easy to deceive? Midwesterners apparently think so, because they use very similar terms for both situations. We tend to agree; nothing good can come from doing business while under the influence.

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New York: Schlep

Meaning: a difficult task, to carry something with difficulty.

As far as hectic places go, New York seems to be leading the rankings. No wonder they have a dedicated slang repertoire for difficult situations. If you are planning on visiting the Big Apple, take it easy; you will most likely encounter a schlep.

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Florida: No-see-ums

Meaning: tiny biting midges.

Ah, Florida! The land of cruises, alligators, and invisible attacking bugs. These welcoming critters are known for attacking at dawn and leaving itchy marks that will sting for days. They go by the government name of Ceratopogonidae, but the no-see-ums nickname seems more accurate.

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Boston: Regular

Meaning: coffee with cream and sugar.

Forget about americanos, lattes, and espressos, a regular is the Boston way to go. Associated with a popular Dunkin’ order, it will come already creamed and sugared. Not advisable for diabetics and lactose intolerants.

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Puerto Rico: A mi, plín!

Meaning: I don’t care.

Puerto Rican slang can be hard to decipher even if you speak some Spanish, but this makes it even more unique. This phrase —literally translated as ‘to me, plin’— is commonly used to express that something or someone is of no concern to you. What is a ‘plin’? We don’t really know, but to us, plin!

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Pacific Northwest: The mountain is out

Meaning: there is good weather

Mount Rainier is one of the icons of Seattle and the Pacific Northwest, even though the stormy weather can often make it difficult to admire. On the days when the sky is clear and cloudless, this natural wonder "is out" and can be seen in its entirety. For the locals, the mountain being out has become synonymous with lovely weather and sunny skies.

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Texas: Fixin’ to

Meaning: about to.

We are including this phrase as Texan slang, but you might hear it from Southerners of other states. What do they use it for? Not to talk about repairs, but to say they are about to do something or getting ready for something. Important: do not confuse it with ‘fixins’, a way to refer to side dishes or condiments.

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Alaska: Sourdough

Meaning: a long-time resident.

Alaska is filled with natural wonders, but it has always been a tough place to live in, especially during the time of the pioneers. These brave people relied on a few food sources, one of them being sourdough starter to make bread and biscuits. In time, seasoned Alaskans came to be referred to as ‘sourdough’, as a way of honoring their resilience and love for the territory. Opposite to a ‘sourdough’, you can find a ‘cheechako’ or newcomer.

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Utah: RM

Meaning: someone who returned from their missionary service.

Utah is known for many things, one of them being its high number of Church of Jesus Christ of Latter-day Saints members (commonly known as Mormons). Many members of the Church choose to serve as missionaries, an activity that can take them to a different state or even a different country for up to two years. Once they come back, they might be referred to as RM, or ‘returned missionary’.

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Hawaii: Da kine

Meaning: placeholder for something.

If you are in Hawaii, you might notice locals using this phrase to refer to various things, similar to how other English speakers use ‘whatsit’ as a placeholder. A common phrase in Hawaiian Pidgin, ‘da kine’ can be used for objects, people, places, ideas, and much more.

1

Apple

Apple Inc. famously started in 1976 in the Los Altos garage of Steve Jobs’ parents. Jobs and Steve Wozniak assembled early versions of the Apple I computer there, selling circuit boards to local computer hobbyists.

What began as a small project between two friends eventually grew into one of the world’s most valuable companies, producing iconic products like the iPhone, Mac, and iPad.

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Amazon

Amazon began in 1994 when Jeff Bezos launched an online bookstore from the garage of his rented home in Bellevue. Early operations included simple desks and computers connected to the growing internet.

From selling books online, Amazon rapidly expanded into nearly every retail category and eventually became one of the largest e-commerce and cloud computing companies in the world.

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Google

Google started in 1998 in a garage rented from Susan Wojcicki in Menlo Park. Founders Larry Page and Sergey Brin worked there while developing their revolutionary search engine.

Their algorithm dramatically improved how people found information online, and the company quickly grew into a global tech powerhouse that now operates under Alphabet Inc.

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Hewlett-Packard

Hewlett‑Packard, often called HP, was founded in 1939 by Bill Hewlett and Dave Packard in a small garage in Palo Alto.

Their first product was an audio oscillator used by sound engineers, including early customers at The Walt Disney Company. That modest workspace is now considered the birthplace of Silicon Valley.

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Disney

The Walt Disney Company traces part of its origin to a garage studio used by Walt Disney and Roy O. Disney in the early 1920s in Los Angeles.

Working with minimal equipment, the brothers produced early animated films that would eventually lead to the creation of Mickey Mouse and a global entertainment empire.

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Harley-Davidson

Harley‑Davidson began in 1903 in a small wooden garage in Milwaukee. Founders William S. Harley and Arthur Davidson built their first motorcycle prototype there.

The company grew steadily and became one of the most iconic motorcycle brands in the world, known for its powerful engines and loyal fan base.

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Mattel

Mattel began in 1945, when Harold Matson and Elliot Handler started making picture frames in a garage workshop in Los Angeles.

Leftover frame scraps were used to create dollhouse furniture, which became so popular that the company shifted its focus to toys. Mattel would later introduce famous products like Barbie and Hot Wheels.

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Dell

Dell Technologies was founded by Michael Dell in 1984. While the company began in his college dorm room at the University of Texas at Austin, early operations soon moved into a small garage workspace where computers were assembled and upgraded.

Dell’s direct-to-consumer sales model helped transform the personal computer industry and made the company one of the world’s largest PC manufacturers.

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Yankee Candle

Yankee Candle began in 1969 when teenager Michael Kittredge II made a homemade candle in his family’s garage in South Hadley as a Christmas gift.

Neighbors wanted to buy the candles, and the small hobby quickly turned into a thriving business. Today, the brand is one of the most recognized names in scented candles.