The best way to make the most of your visit to the cathedral area in Chartres is to take one of the organised tours that go below ground and reveal the treasures that lie in the crypt of the cathedral. Close to the main church building tours begin about every hour in the summer months and are guided in French with a written English translation. You will be treated to a walk along the hundred or so metre long underground tomb where local architecture has been employed at its best to create a fine looking structure.