A regular looking rock with an unbelievable history.

A small house sits between two huge rocks, with its back to the sea.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

Various forms of phallic art decorate this hill in commemoration of legendary local tragedy.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

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

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.