Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

An ancient tomb that still stands in Portugal.

A micronation on an islet along the coast of a Portuguese island.

A neolithic tomb converted into a tiny chapel.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

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

One of the smallest bookstores on the planet.

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

Pagan monument converted to Christianity with the population.

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

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

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

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

A cluster of granite granaries perched on stilts.

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

One of the largest Roman settlements in Portugal.

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

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

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

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

The corpse bride of Portugal.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

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

This crumbling Portuguese ruin overlooks the populace it once ruled.