The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A sculpture serving as an homage to Pope John Paul II.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

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

Macabre astrological automaton clock dating to the late 1400s.

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

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

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

The silly symbol for an underground protest group is now scattered around the city.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

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

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

During World War II, this rice mill became a Nazi concentration camp.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A six-ton wedding present for the King of the Scots.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.