Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

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

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

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.

The Cathedral of St. Ambrose has been hiding a special parishioner within its walls.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The secret medieval communication system will whisk your words above the noise of the crowd.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Christ's blood preserved in a Belgian town.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A small square plaque marks a failed assassination attempt that could have changed history.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The fairy tale castle of the "fairy-tale king."

According to legend a man pooped out the window of this tower to prove that it was straight.

A meteorite-bounded town in Bavaria.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

In this truly magical place, rent hasn't been raised since the year 1520.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.