This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This legendary city has been a tourist attraction for centuries.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

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

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

Elaborate tile work in this railway station tells the story of Portugal.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

A majestic hotel for dreamers rises from the center of a fairytale wood.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A unique seaside cave where Aleister Crowley faked his own death.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

One of the largest Roman settlements in Portugal.

The corpse bride of Portugal.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A 16th-century Andalusian palace.

Giant topiary dog once played a role in a terrorist bomb plot.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.