The Top 12 Natural Monuments around Shell Ridge
Shell Ridge’s landscape is a beautiful place to explore — something that you can best experience by visiting one of our 12
beautiful natural monuments around Shell Ridge. To help you find the one for, you can see all the details you need to explore the best natural monuments, and better plan your next outdoor adventure!
beautiful natural monuments around Shell Ridge. To help you find the one for, you can see all the details you need to explore the best natural monuments, and better plan your next outdoor adventure!
Last updated: November 13, 2025
Eagle Peak
Highlight • Summit
A side peak in Mount Diablo State Park slightly west of the main summit, Eagle Peak with 722m elevation provides great views of Bay Area's most visible volcano peak and …
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Sandstone caves in Castle Rock formations
Highlight • Cave
Water, wind, and calcite erosion in per-volcanic sandstone formation.
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause …
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause …
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Twin Peaks
Highlight • Summit
Just east of the Twin Peaks the trail touches this great overlook with views of the Mt Diablo volcanic landscape.
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Castle Rock Recreation Area
Highlight • Climb
The Castle Rock formations are a popular destination for local rock climbers in this scenic canyon along Pine Creek, with Mammoth Rock the largest. The prominent sandstone amid the oak …
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Sandstone Formations With Holes, Diablo Foothills Regional Park
Highlight • Natural Monument
The rocks in that area are made of sandstone. During our winter rains, acidic rain water seeps into and sits in the rocks. The next summer, the dry heat pulls …
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Extend your search for the best caves by checking out these guides of the top ones around Shell Ridge:
Walnut CreekOrindaRichmondLafayetteConcordNorth GateAlamoDanvilleDiabloBlackhawkClaytonMoragaSan MiguelSaranapEl CerritoKensingtonMount Diablo State ParkContra Costa CentreCastle HillAcalanes RidgeEl SobranteEast Richmond HeightsPinoleHerculesSan RamonSan PabloPleasant HillRollingwoodAntiochTara HillsCamino TassajaraAlhambra ValleyMartinezPittsburgNorth RichmondNorris Canyon
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