A church of bones, decorated with 40,000 human skeletons.

France's most famous cemetery, with some of its most curious tombs.

The world's only museum devoted to the wonders of fluorescence.

These fantastically named natural pools look like something out of a Scottish myth.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A kaleidoscopic warehouse-maze of handmade neon signs.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

Obelisks and stone pineapples in the Irish countryside.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

The first park built over a freeway is a brutalist masterwork.

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

A Bed-Stuy gymnasium that hosts expansive raves, performances, dance parties, and more.