A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

Five mile wide circular ring of rock in the Russian Far East is a curious geological oddity.

A remote forest of stone pillars along the Lena river.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Enormous statue of the Emperor of the Mongols.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

These delicate sand pyramids look like naturally occurring gothic spires.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

The hilltop ruins of a border fortification in the Italian Alps that was much fought over.

A crumbling World War I fort that is reached through a series of concrete tunnels.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Medieval ruins nestled within a breathtaking swath of Spanish nature.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

This haunting location was featured in the final scene of a classic spaghetti western.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A passage grave used in neolithic rituals.