The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

A hidden alley with seven corners and handmade cat decorations.

More than 100 antique vending machines housed in a used tire shop sell everything from candy to sake and ramen.

It is rumored that if you spot this little golden frog hiding in plain sight, good luck will come your way.

A small hippo-shaped fountain in Berlin, Germany.

Visitors may notice something strange walking through this quaint German town.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

The former headquarters of history's oldest megacorporation.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

Cat art as far as the eye can see.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

This painted Lego bridge is the product of over a century of locomotive history.

In this truly magical place, rent hasn't been raised since the year 1520.