According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

Built by the Ancient Greeks, this chariot bridge is still in use today.

Τhis feline monument commemorates fallen soldiers on a field that saw many, many battles.

Naturally protected city carved from a rock face.

Beirut's thinnest building was the result of feuding brothers.

This museum in a shuttered train station remembers the island's forgotten rail system.

A unique art center and shop just below a United Nations Checkpoint in central Nicosia.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Sleep in the hay, spin the wheel and eat grain pellets to your heart's delight.

The sunken structure looks like the victim of a catastrophic flood.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Home to the "Rat King" of Nantes and other wonders of the natural world.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

This 1920s Dutch barge is now a floating bookstore.

The oldest public library in Ireland.

Ancient Peruvian fertility temple or modern money-making hoax? Either way these monoliths still look like penises.

A small, emotionally charged room inside the Mario Testino Museum dedicated to Princess Diana and one famous photo shoot.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

A remarkable geological formation resembling a forest made of stone.

This perfectly preserved Chinese medicine shop was untouched for decades before being reopened as a museum.

Noble beasts perhaps, but not the Emperor's dogs.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.