Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A meow-velous tribute to a beloved street cat, made famous on the internet.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

Vibrant street art created with mixed media.

This abandoned viewing platform has become a monument to unnecessary government spending.

This house's itty bitty size means no humans allowed.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Visitors may notice something strange walking through this quaint German town.

The world's first motorway was used as a racetrack until the late 1990s.

This small train ride offers stellar views of the Grand Garden Palace.

"Drunken ship" sculpture memorializing the French poet in the city where he died.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This garden houses the remains of the ancient Greek port of Marseille.

A medieval military street hidden beneath a charming French fishing village.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This massive blockhead sculpture hides an entire library.

The first modern cemetery of Lyon is complete with more than 200 chapels and monuments.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

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

Inside this museum, Christians were imprisoned when the Romans controlled Gaul.