To get the best out of any place, don't just do obvious things. If you're into megaliths, visit Carnac by all means, but for a sharper experience go to St-Just (top photo) afterwards, and then press on to Monteneuf to see how things were done in neolithic tmes. Take a boat to see the famous carvings on the Gavrinis tomb, but then examine other designs by stooping along the passage and squeezing into the chamber of the Pierres Plates (pictured above) on the Locmariaquer peninsula, or visiting the trio of graves at Mané Kerioned. These are all low-profile sites that give you a real sense of feeling - beyond mere looking. Worth a try?