Established in 1818, the West Point Foundry became an industrial powerhouse in the later 19th century, when its innovative Parrott rifle gave the Union Army a game-changing advantage over the Confederates during the Civil War. The business failed in the early 1900s, and its buildings — as well as a 36-foot high water wheel — fell into ruin. The environmental organization Scenic Hudson came to the rescue, pouring $3.6 million into the site and turning it into an impressive outdoor museum. Visitors can now tour the 87-acre preserve, where (among other things) they can marvel at the model of the gun-testing platform, which was used to fire cannonballs across the Hudson at Crow’s Nest Mountain. 845-473-4440; www.scenichudson.org