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13 natural rock formations that look man-made

By: Angela Nelson on July 19, 2016, 12:40 p.m.
Skull Rock in Joshua Tree National Park in southeastern California

Photo: Jeremy Sternberg/flickr

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Skull Rock

Skull Rock in California is a favorite stop for tourists in Joshua Tree National Park. This rock started forming long ago as depressions in the granite filled with rainwater, leading to erosion. As time passed, the two eyes formed and it started resembling a skull, the National Parks Service says.

These days, the skull is the starting point for a 1.7-mile nature trail through the park, where the Mojave and the Colorado deserts meet in southern California.