How many miles long are the Paris catacombs?

Answer 1

The Paris Catacombs stretch approximately 200 miles (about 320 kilometers) underground, although only a small portion of this network is open to the public for tours. The catacombs house the remains of over six million people and serve as a historical site and ossuary. Their extensive tunnels were originally limestone quarries before being repurposed in the late 18th century.