Ruins

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Remnants of a cone-shaped Nazi bomb shelter.

Abandoned Nazi train station turned underground astroparticle laboratory.

A passage grave used in neolithic rituals.

Decaying 18th-century church converted to a single-family home.

15 monolithic temples emulate an eroding sand castle.

Giant disc-shaped gate took 20 men to close off this city in Madagascar.

Massive stele returned to Ethiopia after 70 years in Rome.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

200-foot-high minaret and only remnant of Afghanistan's lost city of the Turquoise Mountain.

Pagan monument converted to Christianity with the population.

Tower that was a frequent stop on the travels of King James I.

Archaeological site of Iberian people ruins.

A Romanesque tower appears when water levels drop.

Cliffs full of fossils at the portal to England's Jurassic Coast.

Commemoration of a sea voyage gone mysteriously wrong.

Ancient artists in the middle of nowhere.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.