Just when I think I’ve got Paris mastered, I’m foiled. This time it was by a museum. I know that most Paris museums are closed on Monday. After a trip across town on Tuesday, I was surprised to learn that our destination, the Musée Nissim de Camondo at 63 Rue de Monceau in the 8th, is closed Monday and Tuesday. To make the best of our trek, we discovered that little more than a block away at 7 Avenue Velasquez is the Musée Cernuschi (Museum Cernuschi) and that, as a City of Paris museum, it is open on Tuesday. We were delighted to tour this mansion, commissioned by Henri Cernuschi to hold his extensive collection of Asian art.