William Randolph Hearst, one of America’s most famous and rich citizens, well, ever. Most well-known for being a newspaper giant, Hearst used his money to build his own private castle (and that’s not an exaggeration). The grounds include two pools, the Neptune and the Roman bath. One source estimates the property cost about $10 million to construct.
neptune pool
Both are built to the upmost luxury, using marble (lots of it!), gold infused tiles, and many handmade sculptures based off ancient originals. While it is possible to tour the castle, including the two pools, they’re not open for swimming.