Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

A fake Transylvanian castle houses a cathedral of antlers.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A Hungarian pharmacy museum with a box full of mummy powder.

A museum in the childhood house of a medical pioneer.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

An enormous and lavish Gothic church in Czechia.

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

According to local legend, the devil shattered this column after losing a bet.

The statue of a cursed knight is said to come to life every 100 years.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

A historic and beautiful Art Nouveau chamber in a historic railway station.

A surreal statue honoring Prague's favorite literary son.

Monument to a suicide protesting the Soviet invasion.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This spooky statue sits outside a famous Prague theater.