135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Notorious artist squat renovated into legal studios.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The video game-themed street art first popped up in the French city.

The celebrated eyesore created by starry-eyed sweethearts.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Monsters and miniatures are held in equal esteem at this wondrous museum.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

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

This hidden garden boasts amazing views of Lyon.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

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

This abandoned church in central Lyon is missing its front stairs.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.