When we think of catacombs, we think of underground tunnels and chambers, locations where bodies were stored in lieu of a cemetery. Perhaps the most popular of catacombs is beneath the city of Paris, France. There you will find the skeletal remains of more than 6 million people. What you may not know, is that the largest catacomb system in the world is the Odessa Catacombs in Ukraine. There you will find the legend of Masha.