This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

This natural "sea of stones" was once used by the Romans as a quarry.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

This ancient amphitheater was restored in the early 1990s.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This abandoned mine offers a glimpse at what life was like for those who came to Alaska seeking Gold Rush riches.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

Considered by many to be one of the most dangerous highways in Alaska.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

This massive sculptural work outside of Paris was four decades in the making—and it's still not quite complete.

These ramparts, once lined with towers, were constructed in defense of Beaune.

One of the largest squares in Europe contains an entire artificial island.

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

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

The plague quarantine island home to the alleged "Vampire of Venice."

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

Go inside to really appreciate this 500-year-old technological masterpiece.