Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

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

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

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

France's most famous cemetery, with some of its most curious tombs.

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

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

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

London's amazing modernist public square that never was.

East London art gallery showcasing contemporary art from Europe's Eastern Bloc.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

The last four extravagant street signs of London's historic banking street.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.