The Top 20 Natural Monuments around Portola Valley
Portola Valley’s landscape is a beautiful place to explore — something that you can best experience by visiting one of our 20
beautiful natural monuments around Portola Valley. 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 Portola Valley. 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 26, 2025
Tafoni Sandstone Formation
Highlight • Natural Monument
The Tafoni sandstone consists of sand from ancient dunes cemented by water-soluble calcite. Due to calcite, water easily passes through the porous rock, thereby dissolving the calcite and then depositing …
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Windy Hill Summit
Highlight • Summit
The hike from Razorback Ridge trailhead to the Windyhill summit is mostly through shaded sections. Sections of it kept cool from the fog rolling in from the Santa Cruz Mountains. …
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Methuselah Tree – Sierra Morena Trail Access
Highlight • Trail
Trailhead on Skyline boulevard a few steps from the ancient Methuselah tree. Starting point of the Methuselah Trail, and access to the more narrow Sierra Morena Trail.
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Black Mountain
Highlight • Summit
Highest point with a view across Palo Alto, Stanford, the Silicon Valley, and across the Bay. Note the Kaiser Permanente limestone quarry right below, ringed on the south by Permanente …
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Borel Hill
Highlight • Summit
Spectacular 360° surround views from the top of the hill (2513 feet / 766 meters).
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Extend your search for the best caves by checking out these guides of the top ones around Portola Valley:
Daly CitySouth San FranciscoPacificaColmaBroadmoorMillbraeSan BrunoBrisbaneMontaraMoss BeachEl GranadaHalf Moon BayLa HondaLaderaWoodsideMenlo ParkRedwood CityLoma MarWest Menlo ParkAthertonEmerald Lake HillsEast Palo AltoSan CarlosNorth Fair OaksBurlingameFoster CityHillsboroughRussian Ridge Open Space PreserveSan MateoHighlandsBaywood ParkAño Nuevo State ParkBelmont
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