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

A surreal statue honoring Prague's favorite literary son.

Walk through Czech history in Prague's largest graveyard.

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

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

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

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

Naturally formed rock city in Poland.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A striking public sculpture representing the period of martial law in Communist Poland.

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

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

An underground city of salt.

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

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

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.

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

A mesmerizing landscape of 18th-century cellars carved out of the land.

Too much gossip or just missing curfew could land you in here for a couple of days.

An unusual cave filled with rare alien-looking aragonite formations.

A perfectly preserved hill village where the buildings are painted like white lace.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

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