Considered the first rail-to-trail in the United States, the Elroy-Sparta State Trail remains one of the most popular trails in the country. With three rock tunnels and five small towns along its 32.5-mile route, the trail is a favorite Wisconsin bicycling destination. Traveling between Sparta and Elroy, the trail stretches through the communities of Norwalk, Wilton and Kendall, passing by wetlands, prairies, farmland and unglaciated areas. Flashlights and jackets are recommended in the tunnels. The tunnels are dark and cool, even on the brightest days, and water from springs above the tunnels can trickle onto the trail. Bikers should walk bikes through the tunnels.