Keys Brook Waterfall, Princeton, Massachusetts This site in East Princeton features the ruins of a once-bustling manufacturing district, with the remains of a chair maker still visible. The hike is easy, withparking just about 100 feet from the waterfall, making it accessible for casual visitors. Gentle, rolling falls spill to a pool on the north side, while the south side features a torrent of swerving rapids and a stone base. Old mill foundations and cascades are scattered throughout the area, providing interesting historical context alongside the natural scenery. The woods surrounding the stream are fun to explore, thoughvisitors should watch for poison ivy.