Discovered in a peat bog, these horned helms come from a thousand years before the Viking Age.

The ruins of this magnificent Scottish castle blend both Gothic and Renaissance architectural styles.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

Locals believe this abandoned ruin on the outskirts of Bucharest is haunted.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

A Brutalist monument in the middle of a housing estate by artist Victor Pasmore.

A series of idealized caves carved to entertain guests.

The burial ground of two kings and a queen is now a calm city park in the middle of bustling Seoul.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A 2,000-ton rock resting in a state of a delicate balance.

These early 19th-century kilns were used to make coke, a key Ingredient in steel production.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

The largest timber structure in Europe.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This curious, round temple is the oldest still-standing marble building in Rome.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

An ornate "graveyard" for some of the country's forlorn building relics.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

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

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

The oldest candy store in the world has been selling traditional sweets since 1827.