Baroque celebration of the end of the Great Plague of Vienna.

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

An ornate sculpture of an ox in repose marks the former entrance to Nuremberg's medieval meat market, which was destroyed during World War II.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Art historians have debated the identity of this medieval stone rider since the 19th century.

Fantastic views and thousands of love locks.

The last bastion of Roman presence north of the Alps looms over a German town.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

An island on the Venetian Lagoon hosts this stone chair that has nothing to do with the King of the Huns.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This curious, round temple is the oldest still-standing marble building in Rome.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This ancient market is often referred to as the oldest shopping mall in the world.