A madman's personal garden filled with 1,000 sculpted heads.

This experimental utopian "city of the future" in rural India may hold a dark secret.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

This network of tunnels housed an entire village for years, and even had a hall for screening movies.

These passages carved from the Antarctic ice hold strange shrines to the harsh southernmost climes.

One woman's lifelong collection is on display in this unassuming house on an Icelandic fjord.

This elderly couple's hand-picked collection of rare gems is one of the finest in all of Iceland.

This remote eatery and museum is preserved as a time capsule of a small Icelandic fishing town.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

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

Even after the church tried to wipe the practice out, this pagan festival lives on each year in a small Scottish village.

The lake that fills and empties itself at random.

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

Legend says this cave housed a 16th-century cannibal and his family of 48.

Forgotten jail cells beneath this Scottish town hall are now used for delightfully artful storage.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

These 17th-century mummies are no longer naturally preserved, but remain on display today.