Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Salute the leader of the proletariat.

Dictionary Johnson’s favorite feline.

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

A surrealist timepiece by the artist of melting clocks.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

How did a French journalist’s grave become the sexiest statue in the cemetery?

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A unique tribute to the millions of animals who served and died for the British military.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

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

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.