This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Once the home of a hermetic monk, this cave now houses a small church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

A Belle Epoque bordello turned into a themed love hotel.

An antique curios dealer and hybrid taxidermist.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

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

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

This little-known relic crypt holds stolen parts of a Roman Empress.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

The curious underground history of keeping Paris clean.

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

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

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

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.

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

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

Statue of death tucked in the University of Medicine courtyard.

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

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