Bernal boulder

Peña de Bernal is a 433-metre monolith, one of the tallest in the world.

It is located in San Sebastián Bernal, a small town in the Mexican state of Querétaro. It is one of the most touristic sites near the capital of Santiago de Querétaro.

Geological studies indicate the rock is the exposed core of an ancient volcano. Following its extinction, the lava in the interior became solid and most of the rest of the volcano eroded over millions of years. The solidified magma that remains is what constitutes and shapes the monolith.