What is the largest catacomb?

Answer 1

The largest catacomb system in the world is located underneath the city of Odessa in the Ukraine. There are more than 1,500 miles of them that date all the way back to the 17th century.

Answer 2

The Catacombs of Rome, known as the Catacombe di San Callisto, are among the largest catacombs in the world. They cover an area of over 90 acres and contain thousands of tombs and burial chambers.