Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The world's largest collection of witchcraft regalia.

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A stone wall that mysteriously moved three feet from its foundation.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

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

A museum dedicated to the alleged Roswell Incident.

A fiery crater has been burning in the Karakum Desert since 1971.

Hiding the longest subterranean river known in the world.

Malaysian fireflies create a dazzling display as thousands light up in unison.

The beautiful baroque library of the Hapsburg empire.

The fairy tale castle of the "fairy-tale king."

A spectacular cave and a beguiling lake.

A huge musical instrument played by the ocean.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

6000-year-old site covered in more than 50 megaliths.

Ancient artists in the middle of nowhere.

The largest known Ancient Egyptian obelisk.

Ancient Egyptian relief, claimed to depict an electrical light.

Welded sphere dropped from space.

Final resting place of one of Africa's most famous conservationists, murdered by bandits.