explorers




All above-ground metropolises harbor shadow cities beneath. A New York Times reporter spent five days on a subterranean urban hiking expedition, spelunking through NYC’s labyrinthine sewer system. His colorful travel journal details…


Teotihuacan, Mexico, “birthplace of the gods,” is famous for its massive pyramids and the Avenue of the Dead. Now its underground tunnels are revealing more of its secrets, thanks to robot explorers,…