The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

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

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

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.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

This handsomely carved wooden church is more than 800 years old.

What was once an underground Nazi city is now Europe's largest bat reserve.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

In a divided Germany, Potsdam's "central" train station was relocated to the city's southern suburbs to avoid West Berlin.

Designed to resemble foreign architecture, this mosque-looking structure was used to pump water to a royal fountain.

The "Prussian Versailles" that is as glorious today as when it was built.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A bridge that has seen many reiterations over its lifetime.

Walk through the history of a Dutch truck manufacturer, from 1928 to today.

A rare double mill nestled along the banks of the Aa river.

In the Netherlands, one of the world's largest private car collections can be found.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This miniature take on the Kremlin is one Dutch man's retirement project.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.