Stone Age solar temple is aligned with the sun on each equinox and solstice.

An antique curios dealer and hybrid taxidermist.

The largest medical and anatomical collection in France lies hidden from the public.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

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

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

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

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

This museum houses an imposing skeleton army comprised of creatures great and small.

A museum of magic with a Sadist past.

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Rebuilt remains of a temple to Roman god Mithras.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Eighty million natural history specimens call this gargantuan museum home.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.