Amsterdam's Red Light District leaves little to the imagination.

This museum houses and extensive collection of technology contributed by the Polish people.

This extensive collection covers thousands of years of Polish military history.

This fairytale medieval church in Poland originally spent centuries in Norway.

On this Polish road, an optical illusion makes cars seem to roll uphill.

This 13th century Gothic brick castle is the largest in the world by surface area.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Macabre astrological automaton clock dating to the late 1400s.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

An extensive network of secret tunnels was created for the Nazi project "Riese."

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

Relive a Polish uprising via an enormous, century-old cyclorama.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

The silly symbol for an underground protest group is now scattered around the city.

A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.