Semi-mystical manmade towers of rocks decorate this rocky seaside.

"Alleys of Stone" form natural mazes in Spanish natural park.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

A lush indoor jungle fills this bustling Madrid transportation hub.

Romans built the world's tallest artificial waterfall in 271 BC.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

The Pope’s secret escape route.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

An Italian hillside ghost town.

Geothermal waterfalls in Tuscany.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Pompeii's less famous neighbor is still revealing her secrets.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The yawning maw of this pagan visage is said to bite off the hands of liars.