The Puget Sound area is a hotbed of steampunk activity. Seattle hosts a major steampunk convention (Steamposium) and smaller events are held elsewhere in western Washington. It's home base for Abney Park, Nathaniel Johnstone Band and other musical acts, and is one of the few regions with a retail shop (Otherworlds) that specializes in steampunk. Gas Works Park and Georgetown Steamplant Museum are notable landmarks.
If that's not enough, Seattle is the setting for Cherie Priest's Boneshaker, a modern classic of steampunk that won the Locus Award for best science-fiction novel (it also received Hugo and Nebula nominations).
The listings below include locations in the Seattle/Tacoma area and other parts of western Washington. Check out the "Steamiest Places" section for attractions likely to be of greatest interest to steampunks.