BUY THE MEMBERSHIP! I have a dual membership that allows me and my son to hit all of the Carnegie museums including the Warhol. We originally came for the dinosaurs but recently I discovered the hall of architecture because of the Christmas tree display. And while I found the Christmas tree displays to be underwhelming, seeing the old prespia was nice and all the plaster casts of old European architecture. Another benefit is that the Natural History museum is connected to the Museum of Art. One admission price gets you into both..