A striking 12th-century-style castle built on the edge of a cliff.

The world's oldest rose is so tough it survived being bombed in World War II.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

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

A fascinating insight into daily life in the Eastern Bloc.

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

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This "floating railway" is one of the world's oldest monorail systems.

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 small but immensely extravagant palace built by the "Night King."

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A slice of central Asia in the middle of Berlin.

This classic restaurant features a gorgeous mirror-clad room.

A surreal museum of extraordinary industrial objects.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The writer took refuge in this home in Southern France for the last 17 years of his life.

Before the electric telegraph, a chain of stone towers carried messages across France.

This ancient theater was once the home of fierce gladiatorial battles.

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

Balconies that have a most unusual accent.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

Experience architect Le Corbusier's modernist design for living in the home he designed for himself.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.