Versailles
Twenty-one kilometres southwest of Paris. RER Line C from Saint-Michel–Notre-Dame, Musée d'Orsay, or Invalides to Versailles Château Rive Gauche — 40 minutes, then a 10-minute walk to the gates. The palace has 2,300 rooms. You'll see about 20 of them on a standard visit: the Hall of Mirrors, the King's Apartments, the Queen's Bedchamber. The gardens are 800 hectares and free except on fountain show days. Versailles is the easiest day trip from Paris by a wide margin — you can do it in a half-day and be back for dinner. A skip-the-line tour adds value because the ticket queue can be 45+ minutes in summer. Full-day tours add the Trianon Palaces and Marie Antoinette's Hamlet, which 90% of visitors skip. I'd argue the Petit Trianon is more interesting than the main palace — it's where you see how the monarchy actually lived, not just how it projected power.
- Choose this if You want a guided walk through both the Palace State Apartments and the quieter Trianon estate and Marie-Antoinette's hamlet, with skip-the-line entry and historical context
- Skip if You'd rather roam the palace at your own pace or have only a half-day, since the Trianon grounds add significant walking and time