The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

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

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

Hungarian self-built castle.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

"Medieval" castle built in the mid-20th century by one family.

The last bastion of Roman presence north of the Alps looms over a German town.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The great Danube river starts here.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

This doorless 20th-century elevator doesn't stop or slow down.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A church of bones, decorated with 40,000 human skeletons.

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

The topiary maze at the Habsburg hunting lodge.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.