Remembered as where the Rat Pack partied, the 398-room Riviera Palm Springs opened in 1959 and remains a prime example of Mid-Century Modern architecture - and lifestyle. Set on 24 landscaped acres, it has an award-winning dining room, multiple tennis courts, a spacious spa and a free-form swimming pool that resembles a lagoon. A multimillion dollar renovation will add a new pool bar and a wedding pavilion and revamp the lobby.