Rebuilt remains of a temple to Roman god Mithras.

This South London cemetery holds the remains of more than 15,000 people.

The remains of the great moral philosopher reside in a university in London.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An unusual round church in London with a Templar past.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

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

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

An odd museum dedicated to French fakes.

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

The historic Masonic Lodge in which the first-ever female Mason was initiated.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Saintly bones pressed into a wax effigy of a Catholic superstar.

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

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

A museum of magic with a Sadist past.

Statue of death tucked in the University of Medicine courtyard.

Weird wax anatomical models reside here, as do other anatomical specimens.

A surrealist timepiece by the artist of melting clocks.