Deadwood is surprisingly historically accurate. I thought it was a made up place but most of the characters were real people and they really is a town called Deadwood where Wild Bill is buried. The story of Wild Bill is quite accurate right down to the words people were quoted as saying. I'm going to have to visit one day and stay in Seth Bullock's hotel.
http://en.wikipedia.org/wiki/Seth_Bullock
http://en.wikipedia.org/wiki/Sol_Star
http://en.wikipedia.org/wiki/Seth_Bullock
http://en.wikipedia.org/wiki/Sol_Star