Behind-the-Scenes Eiffel Tower Tour Including Champ de Mars’ Underground Bunker. See Paris' most iconic attraction in a whole new way with this behind-the-scenes Eiffel Tower tour. Spend 1.5 hours learning about the famous monument, from a look at the engine room for the hydraulic lifts to a trip under the Eiffel Tower to see the Champ de Mars' underground bunker. Then head in the opposite direction, up to the tower's second level, for excellent views over Paris from the private terrace at the famed Alain Ducasse restaurant, Le Jules Verne. Book and Save 5% Off Behind-the-Scenes Eiffel Tower Tour Including Champ de Mars Underground Bunker.