The Palace of Versailles is about 30 mins on a train from Paris and is really worth doing if you have time – it requires a half day at least.
Tickets are about £20 and give you access to the inside of the palace as well as the extensive gardens and grounds.
Not surprisingly it’s an UNESCO World Heritage site and contains the very famous Hall of Mirrors as well as Marie Antionette’s private estate. It’s fascinating to walk through the extravagant royal residances – everything is gold plated!! You get an audio guide so you can learn about each room.
The gardens are massive and really beautiful. You could spend a whole afternoon walking around them!
Click here to see my full guide to Paris.