Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A surrealist timepiece by the artist of melting clocks.

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

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

This modest marker near Notre Dame identifies the very center of Paris.

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.

The oldest stone house in Paris was built by its most famous alchemist.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

This massive library holds what was once the largest book collection in the world.

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

One of the oldest remaining Catholic churches in England is home to the hand of a 7th-century saint.

This peeling mural of Adam and Eve was inspired by the greenhouses at Kew Gardens.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

A small museum that celebrates the history and culture of the LGBTQ community in England.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This ancient Egyptian obelisk still bears the wounds of World War I.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

The Tudor-style cottage in the middle of the square is not quite what it seems.