John of Argghhh posted a pic of a 6-inch gun at the Castle yesterday, and the comment thread implied the device was located somewhere in the Pacific Northwest. Sadly, my investigative powers were not up to the challenge, and I failed to track down the little beastie in my searching.
This cannon was placed along the path in Woodland Park in 1911:
Cannons from Admiral Dewey's cruiser, the USS Concord, were placed in a plot on the southwest corner of Woodland Park, now called the War Garden.
The USS Concord had a rich history ...
(Displacement 1,710 tons; length 244'6"; beam 36'; draft 14'; speed 14 knots; complement 187; armament 3-6", 1-4")