What better place to start off this list than the renowned Empire of the Dead? Paris may be known as the City of Lights, but when you factor in the creepy dark tunnels winding underneath, it’s more like City of Fright!

The Catacombs of Paris is one of the eeriest and most haunted places in the world and is also considered the largest grave on record. Opened in the 18th century as part of the city’s efforts to decongest its space (and move the occupants which are least likely to go on strike—i.e., the dead), this underground labyrinth with skeleton-lined walls and chambers filled with human bones is home to the remains of about six million people

…Some of which may still be seen wandering around the dark pathways.

Why it’s so scary:

If the complex network of dark passageways stacked with skulls and skeletons don’t affect you, be careful of wandering on your own because there are several stories of people getting lost in the catacombs and never being found alive again.

One such case was a man named Philibert Aspairt who vanished in the catacombs in 1793 and was found only in 1804. His corpse was discovered only a few feet from the exit.

What to look out for:

Ghost from different centuries, strange orbs, spectral lights, voices in the walls, touches from invisible sources, and other paranormal sightings are reportedly considered regular occurrences in the catacombs.