There's a 150-square-kilometer "Zone of Silence" in Mexico - Apparently.
In the Mapimí Silent Zone, located in the northeastern part of the Mexican state of Chihuahua, radio signals and other forms of electromagnetic radiation are mysteriously blocked or distorted. This phenomenon has been observed and studied since the 1930s, with some reports suggesting that even aircraft radar is affected. Scientists have offered various explanations, including unique geological features and unusual atmospheric conditions, but the exact cause remains unknown.