8. Robert Sibley Volcanic Regional Preserve

Volcanic debris has formed vast mountains in this Oakland park, which covers 660 acres in the Oakland Hills. One of the most famous peaks is Round Top, which is made up of lava and other materials from a volcano said to be 10 million years old. Millions of years of erosion and shifting deep within the earth have exposed layers of geology that are amazing to look at and fascinating to learn about. In the spring, wildflowers bloom and add to the beauty of this Oakland preserve and give the hiking trails added bursts of color.   (© 10Best)

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