The catacombs of ancient Rome served as houses of worship for Christians. When surveyed in the early 1800s, the sewers of Paris yielded gold, jewels, and relics of the revolution. And thousands of people lived in the subway and train tunnels of New York City in the 1980s and '90s.
What secrets do the Las Vegas storm drains keep? What discoveries wait in the dark? What's beneath the neon?
