Take a walk in a recreation of ancient Rome.

The history of German architecture is explored across this fairy-scale mini-city.

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

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

An elevator into the Baltic Sea.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

"The most colorful grottoes of the world.

Living trees form the structure of an open-air palace.

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

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Started as a kitchen garden, now the second largest botanical garden in the world.

The most visited, and possibly most controversial, museum in Germany.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

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

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

A gorgeous medieval library where the books are kept in chains.