Antique cinematography artifacts fill this museum dedicated to the inventors of the moving picture.

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

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

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

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An exhibition of preserved locomotives housed in a 1950s depot shows the history of Denmark's railway.

This unique architectural wonder is home to luxury apartments.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The world's largest maze is a nature park with nearly 200 decision points.

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

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Denmark’s never-ending bridge.

At these downtown crossings, pedestrian lights show axe-wielding Vikings instead of the usual walking figures.

This enormous aluminum figure in Denmark lying in a plunged position, echoes the global debate on canceled historical statues.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.