1. Hearst Castle | San Simeon, CA
Swim in a castle much? Yeah, we thought so. Let's change that. At Hearst Castle, two fabulous pools make you long to jump in. Built by pioneering architect Julia Morgan for William Randolph Hearst, the home was a party spot where Hollywood starlets frolicked and soiréed. After Hearst’s death, the home became a National and State Historic Landmark open for tours, but you can also rent either pool (for a steep price). The outdoor Neptune Pool with its Roman statuary, blue-and-black tile work, temple structure and colonnade make swimming an act of fierce, sunlit elegance. But some will prefer the quiet secrecy of the Roman Pool inside, styled after ancient Roman baths, with royal blue and golden glass tiles known as smalti covering the walls and ceiling beams.