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

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

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

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

This oddly shaped church resembles a rocket.

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

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

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

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

One of Europe's largest groups of dolmens remains largely off the typical tourist track.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

The tallest tower in Cáceres's Old Town.

Fragments of human bones are embedded in the walls of this quaint alley.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

A 12th century church completely covered in shells.

1,300 chamber pots and their eccentric collector.

The cave where Saint Genadio meditated and played chess.

One man's remarkable private collection of art from around the world.