The former headquarters of history's oldest megacorporation.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

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

A tiny chapel clings to a precipice above Germany’s gemstone capital.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A castle perched precariously over the Crimean Sea.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

An autonomous republic of Orthodox monks.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This 13th century Gothic brick castle is the largest in the world by surface area.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This precariously perched fortress was once ruled by a crow-worshipping baron.

Near this allegedly haunted pub, you can find strong spirits on the rocks.

A striped 12th-century basilica sits in the countryside of Sardinia.

A Roman temple perched over an Italian town, forgotten several times over.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.