A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

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

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

The hallucinogenic center of the ancient world.

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

This small chapel is built of human bones and decorated with a golden skeleton.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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

A small Portuguese cottage formed between boulders in the countryside.

One of the largest Roman settlements in Portugal.

An honorary saint of the people, Maria Adelaide became an incorrupt corpse, the clothes intact, exhaling “a strong scent of roses.”

A garden in Lisbon filled with giant porcelain creatures.

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

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

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

This crumbling Portuguese ruin overlooks the populace it once ruled.

This star-shaped military outpost is now simply trying to protect itself from neglect.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

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

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

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.