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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Hundreds of hidden passageways weave through the old quarters of Lyon.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Fortified homes of highland warriors that are still in use today.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

Copenhagen's celebrated theme park and gardens.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Human ancestor’s 3.6 million year-old footprints.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A giant Australian fruit and tropical farm.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The celebrated eyesore created by starry-eyed sweethearts.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Famously misunderstood wonder of the ancient world

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

The Uros people live on floating reed islands in lake Titicaca.