A beautiful building that in and of itself is worth visiting but the Nationality Rooms make it even better. For only $3 you get a key to all the rooms on the first floor, those on the 3rd floor are free. My favorite rooms were the Romanian and English rooms but all are worth the visit. I was amazed by how each country was so involved in the creation of their room, even sending over their own architects, artisans and historians to make it accurate and representative. I loved it. So amazing. Definitely leave about three hours to do it properly.