Pagan monument converted to Christianity with the population.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

Portugal's National Pantheon has a history of curses, collapses and financial problems.

The best place in the world to buy tinned fish.

You can cross from one country to another in a single hop on this little bridge.

One of the smallest bookstores on the planet.

A cluster of granite granaries perched on stilts.

One of the largest Roman settlements in Portugal.

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

This crumbling Portuguese ruin overlooks the populace it once ruled.

The corpse bride of Portugal.

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

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Dead weights honor the dead of Portugal's fishing industry.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Ancient catacombs form the foundation for this Rococo orgy of a church.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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

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

A hidden three-foot-wide house separates these two regal churches.

This abandoned five-star hotel is now a five-star urban exploration destination.