This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A Barbados crypt where it's said that the coffins refuse to stay put.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This 17th-century pub once had a hole in its wall so the neighboring blacksmith could easily access beer.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

These two monoliths have stood at the entrance to the neighborhood since the days it was called "Hollywoodland."

The blinking light atop the iconic landmark has been sending secret messages for decades.

The most decorated dog of World War I is preserved in the Smithsonian.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

The world's largest fire hydrant is supposedly tornado-proof.

A bit of retro transportation flair preserved in the world's largest department store.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The second oldest continuously operating bar in Louisiana.