Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

The ghost town where the villagers refuse to leave.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This legendary city has been a tourist attraction for centuries.

A naturally beautiful, seemingly bottomless deep blue spring.

A spectacular cave and a beguiling lake.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

The hallucinogenic center of the ancient world.

Ancient Greek oracle of the dead.

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

On the Oregon coast there is a natural hole that seems to be draining the sea.

A swing to dangle you off the very edge.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

A submerged archeological park still holds the wonders of a Roman Sodom.

The latest in a series of long glass bridges suspended at terrifying heights.

One man's swirling six-acre monument of stone.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

This stunning mass of ice spans 121 square miles and is still growing.

The entire length of the border is marked by a 20-foot-wide slash through the trees.