This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

King Ludwig I's collection of beautiful women.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Thousands of flowers create enchanting pink tunnels over the city streets.

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

This former steel and coal plant is now a neon-lit industrial fantasia.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A fascinating insight into daily life in the Eastern Bloc.

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

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

Where beer lovers can literally immerse themselves in beer.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

The first museum in the world devoted to sexual gadgetry.

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

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A giant portrait of an ancient king looms over the river.