Site of one of World War I's most horrific scenes.

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

The Suurhusen church tower in Germany leans over farther than the famous Leaning Tower of Pisa.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The ancient tomb acts as a calendar that keeps perfect time.

A fantastic castle rumored to be the birthplace of King Arthur.

England's most notorious suicide spot.

Giant naked man on a hillside.

Decrepit Victorian public lift is a white-knuckle ride.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Prehistoric sandstone menhir with Early Bronze Age cup and ring markings, also known as Robin Hood's Stone.

Gothic tower mentioned in Thomas Hardy poem "The Channel Firing."

The oldest working mechanical clock in the world.

Gothic tower where Lord Alfred Tennyson wrote the poem "The Sleeping Beauty."

Famously misunderstood wonder of the ancient world

A monolithic monument in Greater London.

The remains of Crystal Palace Great Exhibition of 1851.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Hear the quietest sound from across the dome.