This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

The library's graceful rotunda is like a bibliophile's temple.

It houses the remains of a 17th-century version of the Titanic.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

For more than two centuries, this family-run establishment has been serving up some of Ireland's best oysters.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

This rocky outcrop served as a quarry for some of the bluestones that sit at the center of Stonehenge.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

After 800 years, Europe's oldest elm tree has met its end.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

This 30,000 square-foot museum is home to an extensive collection of art and artifacts that reflect the history of southwest Ohio.

Part arcade, part museum, this collection features vintage and modern pinball machines.

An unusual waterfall in the Santa Rosa Range, within the Great Basin of Nevada.

The fountain marks the area where hundreds of accused witches were burned at the stake.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

Medical history museum featuring a lovely doctor's office from the 1800s.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.