2. Château de Versailles

Must see. Unbelievable. When there, you’ll understand why the peasants were so upset and want Louis XVI’s head. For trip to Versailles, very easy to use the RER (regional train) from downtown Paris (just like the Metro) and it's a 5 minute walk to the Chateau. BIG TIME SAVER. At the station they have a deal that gets roundtrip train ticket and Chateau ticket. (It also gets you admission to both Trianons and the Hamlet, usually extra, and extra sections in the Chateau, get into special entrance. Otherwise the ticket line looked to be 1-2 HOURS long.