9. Secret Underground Theater Found in Paris Catacombs
Location: France’s Paris
Year Found: 2004 Estimated Value: $5,000–$10,000* (Building Cost)
In the center of France, there is a maze called the Paris Catacombs. The city needed a better place to store the deceased, so it constructed the Catacombs. So, starting in the late 1700s, Paris decided to empty its remains into five-story underground tunnels.

Catacombs of Paris ©Events/stock.adobe.com
This finding is made even more unsettling by the backdrop. A completely functional movie theater was found in August 2004 by Parisian police conducting a training exercise in one of the Catacombs’ previously unexplored chambers. An amphitheater was created by carving terraces into the rock. Inside was a full-sized movie screen, projection equipment, and a selection of thriller and noir films. It appears that someone only wanted to set up their own eerie, private theater because the films were neither unpleasant nor prohibited.
