The first recorded European discovery, that is - of course, there were plenty of indigenous people who had been here before. These days, it's a nice place to see both the Pacific Ocean and flights taking off from SFO.
Across from the expedition marker is another monument. It has a cylinder on top with markers of the various landmarks in the vicinity. The monument is inscribed:
"In memory of Carl Patrick McCarthy whose dedicated efforts for national recognition of the Portola expedition's discovery of San Francisco Bay in 1769 included personally bringing 11,863 visitors to this discovery site and presenting the expedition's history in pictures to 9343 between 1966 and his death October 15, 1981."
In 1769, Gaspar de Portolà and his expedition party discovered the Golden Gate and San Francisco Bay. They had been traveling north from San Diego in search of Monterey Bay, but they missed it because they were looking for something more significant. Portolà ended his voyage here and named the bay after St Francis. The expedition was the first recorded European exploration of California.