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

Houses are tucked between, on, and underneath giant boulders.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

It's unclear what caused the fire that led to this opulent hotel's demise.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

Why walk on this historical site when you can zoom down instead?

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

This sculpture presents commentary on a life in pursuit of profits.

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

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

This railroad track was so secretive that it was omitted from all maps.

Turns out you can see the world without ever leaving Maine.

During World War II, Austria's oldest salt mine was used to store thousands of pieces of stolen artwork.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

Drift through underground caves on a tube.

The oldest continuously-operated inn in the United States, once owned by Henry Ford.

An aluminum skeleton brings Chinese mythology to the French shore.

Journey inside the bowels of this sperm whale sculpture.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.