Building Men of War and Indiamen from Holland's Golden Age.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

An ingenious Dutch land art project uses grass ridges to cut airport noise pollution in half.

Colorful and chaotic stacked hotel in North Holland.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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

A beautifully eclectic mix of architectural styles.

A radio tower with something unusual between its legs.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

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

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

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

A fascinating insight into daily life in the Eastern Bloc.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

This Italian foot path winds through the mountains via 52 individual tunnels.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.