The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

Charles Babbage's proto-computer, painstakingly brought to life.

This top secret Chinese military megaproject is the world’s largest human-made tunnel structure.

An eerie abandoned gentlemen's club built for British officials during the colonial era.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The writing studio of an American adventure author, built in the style of a medieval castle.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

The largest of London's subterranean rivers and once a mad, bad center of London life.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This influential Renaissance-era library was once the haunt of kings and monks.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

This cairn marks the only place where Central European Time, Eastern European Time, and Further-eastern European Time meet.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

Mummified monks and the accidentally interred, in a 17th-century crypt.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."