For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

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

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

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

The narrowest street in Paris.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

The glowing blue Nymphaeum of Emperor Tiberius.

This colorful statue welcomes visitors to a Barcelona park.

A labyrinth of clothing, electronics, and other counterfeit items.

An island graveyard with spectacular views of the Caribbean.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Looming communist pillar with a Czech twist.

Macabre astrological automaton clock dating to the late 1400s.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This metal disk commemorates the birth of a historic American holiday.

A genuine Tudor manor transported piece by piece from England.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The ruins of a medieval monastery named after a type of tree.

This stunning home looks like it belongs in medieval Europe, not North Carolina.