This building was once a railroad station from the 19th century, so as you walk down the center aisle after entering, look up and around at the iron work from the original station, and above all, turn around to admire the beautiful clock over the entrance. Since this article features the building, I will deliberately try to walk you along without mentioning the art works you will stop and see along the route. But as you go down the central hallway, the pre-Impressionists are in little rooms to your left, and dramatic sculptures line the pathway. At the end of the first floor you can walk on a glass floor to look down on a model of 19th century Paris featuring the Opéra and surrounding streets. To the left of this exhibit there is an escalator which takes you up to the Impressionist collection.