The Trinity Atomic Test Site

The Trinity Site in the Jornada del Muerto desert of southern New Mexico is where the world's first nuclear weapon was detonated at 5:29 AM on July 16, 1945. The explosion, code-named Trinity, produced a fireball that briefly turned night into day across New Mexico, Arizona, and Texas. The blast melted the desert sand into a glassy mineral called trinitite that is still faintly radioactive today. Physicist J. Robert Oppenheimer, who led the Manhattan Project, watched the explosion and later said it brought to mind a line from the Bhagavad Gita: Now I am become Death, the destroyer of worlds.

Source: Wikipedia