https://www.vice.com/en_us/article/93w3we/mysterious-monolith-update-third-monol

Yes, for real. Another unexplained monolith has been spotted, this time in Atascadero, California. The ever-familiar silver silhouette stands atop Pine Mountain, which is located between the Bay Area and Los Angeles. It closely resembles the first monolith found in Utah, but the haste at which it was seemingly placed mimics that of its Romanian counterpart. 

According to The Astacadero News, the Californian monolith was not placed in the ground and, “could be knocked over with a firm push.” No news if someone indeed attempted to push it over, but the local news outlet estimates it weighs about 200 pounds.