NRA museum in Fairfax, VA is running an exhibiton featuring Steampunk Guns.
Steampunk is a subgenre of science fiction and fantasy featuring advanced machines and other technology based on steam power of the 19th century and taking place in a recognizable historical period or a fantasy world.
http://www.nramuseum.com/guns/the-galleries/steampunk-guns.aspx
The exhibition will run until end of this year
From: NRA Museum