The Catacombs of Paris are a series of underground tunnels formerly part of a mining operation. In 1785, a portion of the labyrinth-like tunnel system was used to house human remains moved from the Saints-Innocents Cemetery. Remains from other cemeteries continued to be moved to the Catacombs throughout the 1800s. Today, the Catacombs of Paris has been turned into a tourist attraction. It is affiliated with the Carnavalet Museum and has recently renovated entrance and exit points, including a bookstore and boutique.