Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Ruins of a German castle on top of a towering stone pillar.

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

The most visited, and possibly most controversial, museum in Germany.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Started as a kitchen garden, now the second largest botanical garden in the world.

An eerie, derelict amusement park in Berlin.

One of the smallest bookstores on the planet.

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 tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

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

This architectural beauty is the home to a personal collection of more than 600 examples of mechanical musical instruments.

This crumbling Portuguese ruin overlooks the populace it once ruled.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

A meteorite-bounded town in Bavaria.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

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

A lush oasis full of vibrant plants and striking geometric displays.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

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

These small, triangular, colorful houses are a staple of Madeira Island.