An enormous and lavish Gothic church in Czechia.

A cheeky architectural easter egg.

Be(w)ar(e) the moat around this historic Czech castle.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

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

Pilgrimage site for star-crossed lovers.

Two stone columns flank the grand Venice square, but there were supposed to be three.

100 year tradition of fist fights, marked by marble footsteps.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The walls and streets of the ancient city are peppered with penises.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

In medieval times this small stone seat was used as a bizarre way to punish insolvent debtors.

The tomb of the mythological founder of Padua is not hidden in some obscure crypt, but stands right in the middle of the city square.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.