Fort Stevens, just outside Astoria, Oregon, was first built to protect towns on the Columbia River during the Civil War from Confederate gunboats, it was actually finished after the Confederate Army surrendered. The fort continued to expand and grow in the following years. During WWI, a number of the gun emplacements were shifted to France. During WWII, it was the site of the first attack on the US continent when a Japanese submarine tried to shell the fort.
We spent the afternoon walking the grounds, learning the history of the fort, and exploring the bunkers & gun installations. An interesting day immersed in cool history, but a little creepy.