A cluster of granite granaries perched on stilts.

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

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

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

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

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

A garden in Lisbon filled with giant porcelain creatures.

This crumbling Portuguese ruin overlooks the populace it once ruled.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

A small Portuguese cottage formed between boulders in the countryside.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

Houses are tucked between, on, and underneath giant boulders.

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

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.

A submerged village appears when dam levels drop.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

A beautiful but toxic fountain of mercury.