Castle Rock Ridge defines the high country between the Santa Clara Valley and the San Lorenzo River drainage in this 2012 study. The landscape is a network of ridges and gulches, dominated by the notable Mount Bielawski and its associated Mount Bielawski Lookout. Cultural landmarks such as Hakone Gardens and the Villa Montalvo Arboretum are situated along the northeastern slopes, while the legacy of early habitation is visible in sites like Uncle Billys Cabin and Stuart Camp.
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1889 · San Jose
USGS Topo · 1:62,500
1897 · San Jose
USGS Topo · 1:62,500
1897 · Palo Alto
USGS Topo · 1:62,500
1899 · San Jose
USGS Topo · 1:62,500
1899 · Palo Alto
USGS Topo · 1:62,500
1902 · Santa Cruz
USGS Topo · 1:125,000
1916 · New Almaden
USGS Topo · 1:48,000
1919 · New Almaden
USGS Topo · 1:62,500
1940 · Los Gatos
USGS Topo · 1:62,500
1941 · Palo Alto
USGS Topo · 1:62,500