This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

The Gaudí-inspired building that was the start of Terrassenc modernism.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

An out-of-place grove of sequoias thrives in northern Spain.

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

A huge cathedral single-handedly constructed by one eccentric monk.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Bacteria and algae give the salty water its bubblegum hue.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

An architect transformed this abandoned cement factory into his castle-like workshop.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.