The Flume is a natural gorge extending 800 feet at the base of Mount Liberty. The boardwalk allows you to look closely at the growth of flowers, ferns and mosses found here. The entire loop takes approximately 1.5 hours and finishes at the Flume Building. A natural wonder in the heart of New Hampshire, is open for self-guided nature hikes. Explore its towering granite walls, cascading waterfalls, and lush forests at your own pace. Open May-October.