Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

The last of Amsterdam's original sea level markers remaining in place.

A floating cat sanctuary on an Amsterdam canal.

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

Where royalty waits in the height of luxury.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

This building has survived for more than a century and remains virtually untouched.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Check the time in 145 countries at once with this East German relic.

A curious memorial to the Berlin Wall, German division, the war, and those who died at the wall.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Reminders of the Battle of Berlin still scar the railway.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

Cold war icon and onetime "hole" in the iron curtain.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.