A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

These 1,500-year-old remains were found in a mysterious Anglo-Saxon mass grave.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

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

An English explorer's vast natural history collection has the first realistic dioramas of animals staged in their natural habitats.

Grotto replete with mystical designs laid out in glued shell mosaics.

This striking, two-toned confluence of rivers is visible from space.

A slice of central Asia in the middle of Berlin.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

Legends surround this jagged rock formation in the New Mexico desert.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

The island of Lanai in Hawai'i is a paradise for cats and cat lovers.

South Korea's only sex-themed park.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

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

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

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.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Six beautiful wooden giants are hidden around Copenhagen.

A walkable map of the world, made from soil and stone by one man.

This hotel has hardly changed in over a century, like a time capsule of old Oregon.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.