This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Historic medieval fortified city in southwest France.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.