6044 David Murdock Estate
West of Westlake near Lake Sherwood is an estate overflowing with massive sculpture-like boulders. Here's a link for it on Google Maps.
There are some magnificent oak trees and several intricate buildings including a large greenhouse and a pagodas in ponds. There's an article that describes it as the estate of David Murdock and Conservatory (top) within Ventura Farms affiliated with the California WellBeing Institute on Hwy.101 a few miles away. Someone posted ground-level photos telling of the River Kwai boulder "sculptures." There's also an article that mentions the property and its multi-billionaire owner here: