Zona Del Silencio or the Zone of Silence is an area deep in the Mexican desert. It is the home of several rare, mutant species of animals (including the purple cactus and a malformed version of the desert tortoise). The area’s name derives from an odd anomaly that prohibits radio waves from transmitting inside the zone. When asked about the strange phenomena, the locals invariably reply that they do not see strange things in the desert, only strange people.