Hill Tunnel, the Sideling Hill Tunnel is now part of the Pike2Bike Trail. Together, the two tunnels as well as the roadway are commonly known as the Abandoned Pennsylvania Turnpike. Sweet Root Natural Area Sweet Root Natural Area is a section of the Buchanan State Forest, located near Chaneysville, Pennsylvania. As a state-designated Natural Area, Sweet Root is protected from almost all development, including roads and power transmission lines. The reserve protects the upper reaches of Sweet Root Run and the water gap it has carved through Tussey Mountain. The gap contains a old-growth forest of Eastern Hemlock, Sweet Birch, Eastern White Pine, American Basswood, and White and Red Oak, but the hemlock trees are being devastated by the Hemlock woolly adelgid. The remains of an early mill and a saltpetre cave from the Revolutionary War are also within the Natural Area. The saltpetre was used in the production of gunpowder. Current reserve size is . Nearby state parks and special areas Cowans Gap State Park is located in Fulton and Franklin Counties within Buchanan State Forest. Special areas in Buchanan State Forest include Sweet Root Natural Area, Pine Ridge Natural Area, Martin Hill Wild Area, Redbud Valley (known for bird watching), and four picnic areas. There are three other state parks in District #2: Buchanan's Birthplace State Park (Franklin County) Shawnee State Park (Bedford County) Warriors Path State Park (Bedford County) Neighboring state forest districts The U.S. state of Maryland is to the south: Rothrock State Forest (north) Tuscarora State Forest (northeast) Michaux State Forest (east) Forbes State Forest (west) Gallitzin State Forest (northwest) References Note: Map showing districts after the July 1, 2005 realignment Buchanan Protected areas of Bedford County, Pennsylvania Protected areas of Fulton County, Pennsylvania Protected areas of Franklin County, Pennsylvania