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If you can get to the top of Tour Montparnasse on a clear day, you'll be rewarded with a vista unmatched in all of Paris. The viewing deck is open until 10:30 pm (11:30 on Friday and Saturday), so you can watch the lights sparkle on the Eiffel Tower at the top of the hour. The Catacombs and the Fondation Henri Cartier-Bresson are closed Monday. The Cimetière du Montparnasse is open daily.