Hillsborough

A 50-acre floating bog with peat deposits up to 30 feet deep, accessed via the Mud Pond Trail through Fox State Forest. The Simm Boardwalk extends about 100 feet onto the peat mat to a screened wildlife blind where you can sit undisturbed and watch birds over the open pond. The trail also passes through an old-growth virgin forest remnant with trees over 200 years old.

A rare red maple-black gum basin swamp containing black gum trees over 400 years old — some of the oldest trees in New Hampshire. The basin was carved by a continental glacier roughly 12,500 years ago. Black gum is predominantly a southern species, making this far-north stand ecologically significant. The trees turn brilliant scarlet in fall before any other species.

A multi-tiered waterfall on Beard Brook set beneath a dry-laid stone arch bridge from the 1830s-1850s built without mortar or cement. A short footpath downstream leads to a stunning view of the cascades. Part of the largest extant cluster of dry-laid stone arch bridges in the United States.

Five surviving dry-masonry stone arch bridges built by Scottish and Irish immigrant stonemasons in the 1800s, designated a National Historic Civil Engineering Landmark by ASCE in 2002 — only the second such designation in New Hampshire after the Mount Washington Cog Railway. Built because flooding kept destroying timber bridges. Four of the five remain in active daily use.

A 1,455-acre state research forest with 22 miles of trails that sees far less traffic than state parks. The Hemlock Ravine along Valley Road features a stately stand of mature eastern hemlock along Gerry Brook, while the Ridge Trail forms two loops with varied terrain. Also contains the historic Gerry Cemetery and serves as an active forestry research site.