This remote Scottish cave has been a site of Christian pilgrimage for many centuries.

This enchanting hill is home to fairy lore and a sinister local mystery.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

A large measuring stick marks the lowest point of a country that is partially under sea level.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

This unique rock formation has become a popular walking trail.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.