We arrived late for our tour due to heavy traffic in Paris. Fortunately, the tour guide from City Vision quickly arranged for us to join another tour. She escorted us to the Palace of Versailles and ensured we were settled with the new guide. This location is a must-visit when in Paris, but be sure to dedicate a full day to explore its vast grounds. I recommend taking the little train within the gardens, which allows for unlimited hop-on, hop-off access (just remember to keep your ticket receipt).