A Neolithic burial site built 1,000 years before Stonehenge.

Take a walk in a recreation of ancient Rome.

This former steel and coal plant is now a neon-lit industrial fantasia.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

This massive subterranean fissure is known as the "underground Grand Canyon."

This historic stone bridge has an entire neighborhood clinging to its sides.

It's always summer at the beach inside this former airship hangar.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Artist and musician Will Menter creates musical sculptures.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

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

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

If they push on just the right spot, even the weakest person can move this titanic boulder.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

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

The first island in the world designated a light-pollution-free astronomical observation point.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

A passage grave used in neolithic rituals.

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

One of the greatest maze designer’s greatest mazes.

A unique underground structure dating back to the 1st century BC.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

This castle-fortress is a living example of the transition from medieval defenses to modern fortifications.