This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

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

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

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This subterranean necropolis holds three floors of antler-dug grave caves.

A narrow strip of land is home to the tallest migrating dunes in Europe.

A small museum contains one of the largest collections of ethnic and traditional headgear in the world.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

Just another terrifying garden filled with hundreds of endlessly smiling doll people.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

A black cat protests the City Guild in Riga's Old Town.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

3,000 market stands in five former Zeppelin hangars.

Flamboyant architecture from the turn of 20th century.

Budapest's Communist-era statues, banished to the suburbs.

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

The great Danube river starts here.