See Fossils in Zona de Silencio

The Silent Zone, which stretches into Coahuila, is extraordinary because of a rare natural phenomenon caused by the electromagnetic waves emitted by the sun and earth. They interfere with other electromagnetic waves, such as radio and television waves, creating zones that are completely silent.

It is a truly unusual area, cloaked in myths. It is even said that UFOs, ghosts, and meteorites appear here. A bike or horseback ride will let you view the fossilized remains of marine organisms, cool off in hot springs, or take a dip in an underground spring.