Ruins of a German Castle on top of a towering stone pillar.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Temple complex that once housed the famous statue of Nike.

Monasteries on rock pillars, once accessible only by frayed ropes.

This famous city eluded concrete detection until the early 2000's.

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This elegant arc of a waterfall marks a religious turning point.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

A glacier pocked with ice caves and surrounded by rainforests.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This hilltop warren of monastic dwellings is the result of centuries worth of Mongol attacks.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

Once the scene of a young boy's home in revolt, this Norwegian island is now home to the world's first "ecological" prison.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.