Watch California's Gold Season 20 Episode 9 Online

Huell gets a behind the scenes tour and takes the “swim of a lifetime” in the Neptune Pool at Hearst Castle, which is arguably one of the most spectacular pools in the world and the highlight of any tour. It is fed by mountain water and is surrounded by ancient Roman style columns and statues. Designed by architect Julia Morgan, the Neptune Pool was started in 1924 and was finally completed after several redesigns and re-buildings in 1936.