Hike Mt. Diablo's "Rock City": The Bay Area's Answer to Joshua Tree

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Hike Mt. Diablo's "Rock City": The Bay Area's Answer to Joshua Tree

Here’s a great free weekend hike idea from SFGATE’s Freda Moon. An hour from SF is a maze of towering oddly shaped boulders. Some rise overhead, looming like fortresses. Others sprout like oversized puffball mushrooms, almost too perfectly round and artfully positioned to be real. Still others are pockmarked with mysterious “wind caves,” big enough to crawl inside and sit perched on the face of an ancient rock wall. Surely, writer Freda Moon fou…