Peña de Bernal (in English: Bernal’s Boulder or Bernal Peak) is the second-largest monolith in the world, after Mt. Augustus, Western Australia. At 350 meters (1150 ft) it is also the fourth-tallest monolith in the world, after Mount Augustus, the Rock of Gibraltar and Sugarloaf Mountain.
According to Leonor López Domínguez of México Desconocido, the porphyrytic monolith was formed some 100 million years ago during the Jurassic period, when it must have been at least three times higher than today.
Many people make a pilgrimage to the highest point hikeable, visiting a little chapel about halfway up. On the Spring equinox, people gather all dressed in white to form a human belt around the monolith.