A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

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

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

The personal library of the founder of modern neurology is open to visitors.

The first green space constructed on an elevated viaduct.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

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

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A scattered trail of street art adds a pop of color to the city's stark structures.

Largest lake in Great Britain measured by surface area.

This stately estate house features a tower covered in a bright, modern mural.

This Scottish bridge seems to compel dogs to leap to their death.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

A stunning Victorian abbey and walled garden on a lakefront.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.