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

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

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

A memorial to honor those who were killed in a Bastille Day terror attack in Nice.

This saucy statue once caused outrage among locals.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

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

Hilltop garden on the site of an old fortress overlooking the Mediterranean Sea.

Ancient paintings known as the "Sistine Chapel of Cave Art."

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

The famous winding walk at Chartres is surrounded in mystery and myth.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Historic medieval fortified city in southwest France.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A reconstruction of a classic mansion on the island of Delos was designed for a historian and archaeologist.

A place to see how French aristocrats lived in the early 1900s.

This ancient theater was once the home of fierce gladiatorial battles.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

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

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.