This man-made mound monument was built out of soil from all across the Polish empire.

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

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Museum dedicated to the terror regimes of Hungary.

Renowned mathematician and physicist Carl Friedrich Gauss once worked at this observatory.

A beloved street vendor is memorialized outside a German train station.

One of the oldest student jails in Germany.

It commemorates one of the world's earliest telegraphs.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.

A preserved college lock-up that recalls a clubhouse approach to discipline.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

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

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The prototype for all Nazi concentration camps.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.