This giant, 83-year-old ship elevator is an engineering feat to behold.

Hamburgers are intensely proud of their tunnel beneath the river.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

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

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

An underground city of salt.

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

These massive moving sand dunes have swallowed an entire village and are still on the run.

Krakow's own version of the Hollywood Walk of Fame.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

Ruins of a German castle on top of a towering stone pillar.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

An abandoned train station in Munich constructed for the 1972 Olympic games.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

This futuristic German television spire is actually the world's largest digital clock.