Lost River Gorge | Boulder Caves & Waterfalls in Kinsman Notch NH

Lost River Gorge & Boulder Caves is one of New Hampshire’s most unique natural wonders, tucked in scenic Kinsman Notch in the White Mountains. Formed by glaciers and powerful water flows, the river disappears beneath massive granite boulders, creating a maze of caves, cascades, and dramatic rock formations.

Walk the 1-mile wooden boardwalk trail that winds through the gorge, offering close-up views of 11 boulder caves, waterfalls, and towering walls. More adventurous visitors can climb into the caves (sturdy shoes recommended). Additional features include a Forest Adventure Trail, treehouse, suspension bridge, and even a giant bird’s nest lookout. It’s an immersive, hands-on experience that highlights the raw power of nature while remaining accessible for all ages. Especially beautiful after rain or in autumn foliage, Lost River Gorge delivers unforgettable White Mountains magic.