Visited the Buffalo Bill Historical Center at Cody about two years ago and it is truly impressive.
Picture of Teddy Roosevelt's F Grade Fox below.
Also of note downstairs are side by sides, mostly hammer guns donated by Bill Furnish. They are displayed vertically in pull out drawers with glass on both sides to really get a good look at them. I believe there are about 200 or 300 displayed there with lots of documentation. I have photo's somewhere but couldn't find them.
Found my pictures of TR's F Grade Fox tho. Also front and back pictures of the original Fox factory order card. Also a picture of Tom Kidd when he owned the gun back in 1988. And I had the pleasure of shouldering Teddy's gun when Tom owned it.
Definitely a great place to visit.