Museums are an excellent way to visit historical and artistic firearms. 
There's a difference between seeing a gun online or in a book and seeing it in person, displayed with its documentation, history and provenance.
Museums
The Vampire Killer at the NRA National Firearms Museum in Fairfax Virginia
The Horace Greeley IV "Pumpkin Gun" at the NRA National Firearms Museum in Fairfax Virginia
The Gene Autry Tiffany Dragoon at the Autry Museum of the American West in Los Angeles
Tiffany designed Smith & Wesson at the Royal Armouries Tower of London