A swath of France so devastated by war it is still forbidden to go there.

This riverside restaurant has been serving customers since 1146.

This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

One English town's celebratory landmark spurred more trouble than anticipated.

A rare example of this century-old British tank stands near the center of town in Ashford.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Water and windows define this defensive Italian well.

The wilderness of northern Sweden is full of shelters to protect people from sounding rockets returning from space.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

A memorial to a Swedish hockey player's "encounter" with aliens.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

The site of a mysterious pony massacre is rich with extraterrestrial conspiracy theories.

A 2,000-year-old engineering wonder hides beneath an Italian town.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

This fortress played a key role in the battle that would ultimately give rise to the Maratha Empire.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

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

Legend has it fairies gathered at the site of this medieval castle.