A hip bar decorated with walls of golden skulls.

Where beautiful signs live on forever.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The magic's in the hole!

A fifth-century temple improbably built into the side of a cliff.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Become a prohibition rebel.

Stalactites and stalagmites in a beautifully lit cave.

The atmospheric road was never meant to be so creepy.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Abandoned railway line circling the city of Paris.

Pompeii's less famous neighbor is still revealing her secrets.

The oldest stone house in Paris was built by its most famous alchemist.

The remains of diamond fever taken over by the desert.

The intriguing personal collection of a professional demon-chaser.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

New York's oldest magic store.

A giant Troll lurks under one of Seattle's oldest bridges.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.