This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

This impressive rupestrian engraving dates back to the Upper Palaeolithic period.

An 11th-century medieval castle cascades over the town of Numão.

Come for the bread-themed puppet show, stay for the buffet.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

This castle has links to Portugal’s founding and struggles for independence.

This giant sculpture made of trash is a critique of society's wastefulness.

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

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

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

Europe's oldest still-operational tea farm also boasts a spectacular view.

A small but charming botanical garden that contains many exotic plant species.

Building owners can take out tiles for free at this repository for historic building materials.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.