Where Kevin Eastman and Peter Laird created their "heroes in a half shell" and founded Mirage Studios.

Mounds of fine golden sand that can rise nearly 500 feet tall.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

This Welsh dockyard was the site of the not-so-secret construction of the Millennium Falcon for the original Star Wars trilogy.

This pier made of ice and constructed over the Antarctic winter is used when the resupply cargo ships arrive in summer.

This sprawling collection hides many charms.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

At this Nashville restaurant, cheese and charcuterie arrive via conveyor belt.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

Natural time capsule containing an alien ecosystem.

This Cleveland mansion has played host to a German singing group, a Prohibition-era speakeasy, a funeral parlor, and many civil rights meetings.

Local legend holds that if you can make it up this steep cobblestone stairway without taking a breath, you'll have wish come true.

After 800 years, Europe's oldest elm tree has met its end.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This ruined castle is said to be the legendary keep of a Viking princess.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A museum celebrating the Victorian obsession with hair art.

This two-room factory has been cranking out the musical signifier of zaniness for a century.

A natural gas leak provides a flickering flame beneath a waterfall.