Every inch of this chapel is covered in craftsmanship from across the world.

Fortified medieval tower house with lovely roof garden.

Peek through a transparent pyramid and drink in the mountain made of books.

A miniature city, once ruled by the Queen of the Netherlands.

The largest 19th century panorama in the world still in-situ.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

The home of a neoclassical master is now a shrine to his chosen art style.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The world's only museum devoted to the wonders of fluorescence.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

The attic of a four-century-old canal house hides a clandestine church.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Where once there was a train station bathroom, there is now this German burger joint.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A museum dedicated to a Cold War era sausage.

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

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

Giant, friendly pelicans in Central London, the most unlikely of places.

Elaborate series of tunnels where traces of mass suicide are still visible.

Mummified monks and the accidentally interred, in a 17th-century crypt.