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.

3

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.

7

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.

1

Titanic & The Music Man

Image: Copyright © 1962 Warner Bros. Pictures Distributing Corporation - Public domain, via Wikimedia Commons

It is common knowledge that Titanic (1997), starring Leonardo DiCaprio and Kate Winslet, fictionalizes the true story of the sinking of the British ocean liner that collided with an iceberg in the North Atlantic.

The Music Man (1962), on the other hand, is a musical that tells the story of a salesman who tries to convince the residents of a small town in Iowa to start a musical band. Although the two films are set miles apart and their characters are very different, they both take place in the same year: 1912. Fascinating, don't you think?

2

Mary Poppins & The Wild Bunch

Image: From the studio of John Schwartz., Public domain, via Wikimedia Commons

Early twentieth-century London, a vibrant, sprawling city, has almost nothing in common with the wild U.S.-Mexico frontier of the same era. Yet the tender Mary Poppins (1964) and the epic revisionist Western The Wild Bunch (1969) take place during virtually the same years. Despite being vastly different stories, the two films share a similar theme: the concept of outsiders navigating a world of change and challenges.

3

There Will Be Blood & Meet Me in St. Louis

Image: Metro-Goldwyn-Mayer (Loew's Inc.), Public domain, via Wikimedia Commons

What do a Christmas musical from 1944 and a 2007 drama film have in common? They both portray the early years of the 20th century!

While There Will Be Blood is a dark film that focuses on the California oil rush, Meet Me in St. Louis , starring the iconic Judy Garland, portrays the well-to-do life of an upper-middle-class Missouri family. Watching these two films truly paints a picture of what America was like at this time in its history.

4

Grease & Malcolm X

Image: Library of Congress

Two other films that offer their version of American life during a specific era are Grease (1978) and Malcolm X (1992). Both take place around 1958, but couldn't be more different.

Grease , a romantic musical with gelled hairdos and poodle skirts, portrays a group of teenagers more concerned with leather jackets, rock and roll, and fashionable cars than anything else. Malcom X , on the contrary, is based on the biography of the famous African-American activist, and dives deep into the history of the civil rights movement.

5

Barry Lyndon & Pirates of the Caribbean

Image: William Hogarth, Public domain, via Wikimedia Commons

The story of a young Irishman trying to climb the ladder of British high society can't be too different from that of a pirate sailing through dangerous waters. However, although Barry Lyndon (1975) and Pirates of the Caribbean: On Stranger Tides (2011) take place in the 1750s, they are very dissimilar films.

While Pirates of the Caribbean is a fantasy adventure franchise chronicling the adventures of the endearing Jack Sparrow, the historic drama directed by Stanley Kubrick won four Academy Awards and is considered one of the greatest films ever made.

6

The Godfather: Part II & 1917

Image: Ernest Brooks, Public domain, via Wikimedia Commons

The year is 1917, and a young Vito Corleone takes his first steps in the criminal world in his native Sicily. Meanwhile, in northern France, a young British soldier is sent on a mission to save his brother.

1917 (2019) is inspired by the true story of World War I battles, and The Godfather: Part II (1974) is based on the fictional story written by Mario Puzo about a gangster family. Both films, however, portray the same period of European history, an era that had a huge impact on American society.

7

Jobs & 2001: A Space Odyssey

Image: Niketh Vellanki

Surely, when Stanley Kubrick directed 2001: A Space Odyssey, he was envisioning a more advanced future. But the truth is that the real 2001 was marked, among other things, by the launch of Apple's iPod.

The film Jobs (2013) begins precisely with Steve Jobs' presentation of the device that would forever change the way we listen to music. Intergalactic travel as a common currency will have to wait a few more years. Yet, to be fair, HAL 9000 is pretty much like the artificial intelligences we have today —let's just hope they don't betray us!

8

The sound of music & Harlem Nights

Image: Sanja Lazic

While a young governess falls in love with Captain von Trapp with the Austrian Alps as a backdrop, on the other side of the Atlantic, a nightclub owner in Harlem must face powerful gangsters to stay in business.

Although they may seem like two incompatible plots, The Sound of Music (1965) and Harlem Nights (1989) both take place in 1938, when the United States was recovering from the Great Depression and Europe was at the dawn of the Second World War. Two opposite views of the world.

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13 Going on 30 & The Wolf of Wall Street

Image: engin akyurt

One is an innocent romantic comedy full of '80s pop culture references, and the other is a dark, full of foul language and racy scenes, portrait of the years when yuppies and stockbrokers dominated the New York scene. Yet, both 13 Going on 30 (2004) and The Wolf of Wall Street (2013) take place in 1987. Have you ever thought about it?

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Hairspray & The Shape of Water

Image: Larissa Megale

The interesting thing about these two films is that they not only take place in the same year—1962—, but also in the same ‘place’: Baltimore, Maryland.

Hairspray (1988), a cult comedy directed by John Waters, tells the story of young Tracy Turnbland's quest to be taken seriously in an audition for a popular show for young dancers. The Shape of Water , on the other hand, is a fantasy film that portrays the love story between a mute woman and a humanoid amphibian. Two very different plots that offer a glimpse of what life was like in America during the Cold War.

1

The MapQuest printout ritual

For many travelers, the trip really began here: sitting at the computer just minutes before leaving and printing turn-by-turn directions from MapQuest. The printed pages listed every step of the route, including the distance between each turn. This method was probably the one that marked the transition from traditional paper navigation to modern GPS systems.

2

Free maps at gas stations

Back in the 1920s, advertising executive William Akin came up with an idea to promote the new Gulf Refining Company gas stations. At the time, drivers still had to buy gasoline in five-gallon containers because service stations were uncommon. Akin proposed distributing free local maps in each area where these Gulf stations were located.

The idea spread quickly, and other gas companies soon adopted the same strategy. Over time, gas stations became natural stops for travelers, and many stations eventually began selling maps instead of giving them away.

3

The American Automobile Association Trip Triks

No way you forgot this one! If you were a member of the American Automobile Association, you had access to Trip Triks: spiral-bound booklets customized for each traveler’s route. AAA staff highlighted the exact path on the map, marking gas stations, hotels, and attractions along the way.

4

Lost? Find a phone booth

Lost in the big city? Step into a phone booth. Back then, many phone booths had maps inside showing nearby streets and landmarks. If you were lost, all you had to do was step inside, and within a few minutes, the problem was solved. The good news was that big cities had a phone booth on almost every major corner and intersection, so if the one you stopped by was already taken, you only had to walk a few steps to find another.

5

The thick book that lived in every car

The city street atlas. One of the best companions for drivers, if not the very best. These thick books showed detailed maps of entire cities, page by page. If you spotted a street sign but had no idea where you were, you could look up that street in the atlas index. It would point you to the exact page and grid where the street appeared, helping you figure out your next move. Do you remember flipping through a street atlas to find your way across a city?

6

Asking locals for directions

Following directions back then required a bit of blind faith. You might hear something like, "Drive a few miles and turn left when you see the church," or "After the green restaurant, take the second road on the right." In rural areas, where road signs were scarce, a local’s guidance was often the best map you could get. Sometimes those directions were the only way to find a place that didn’t appear on any map. Have you ever followed directions like these and hoped for the best?

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The co-pilot seat

This trick required teamwork. If you weren’t traveling alone, one passenger was usually designated as the "navigator." Their role? Reading the map, watching for road signs, and warning the driver about upcoming turns. A good navigator also had to learn the driver’s rhythm: when to speak up, when to stay quiet, and how quickly directions needed to be given. The best driver–navigator pairs worked together almost like Batman and Robin.

8

The Rand McNally Road Atlas

The Rand McNally Road Atlas is one of the most iconic travel tools in American road trip history. The atlas includes detailed maps of every state, showing highways, towns, and points of interest across the United States. For decades, it was a common sight in glove compartments and truck cabins, guiding travelers from city to city. Unlike digital navigation, the atlas allowed drivers to see the entire route and explore alternative roads along the way. Even today, many travelers still keep one as a backup option when cell service or GPS fails.

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Following highway numbers

During the era of long road trips, drivers didn’t worry much about street names. Instead, they followed highway numbers. If you got on the right road, like Route 66 or U.S. Route 1, you could relax and stay on it for miles and miles, sometimes across several states. As long as the number on the signs stayed the same, you knew you were still on the right path. This approach later helped inspire the Interstate Highway System, which made traveling across the country even easier.

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The church, the bridge, the water tower

Here's one of the classic road trip tricks: remembering landmarks along the road. This method required both memory and self-trust. Instead of coordinates or exact addresses, travelers remembered particular spots. They learned to look for things that stood out, like churches, bridges, water towers, or unusual buildings. When you reached the right one, you knew when it was time to turn. What landmarks did you rely on the most?