About 100 covered bridges have existed in Maryland during the past 200 years, but only 6 remain, with 3 of them in northern Frederick County and 2 in close proximity to Thurmont. Roddy Road Covered Bridge, built in 1856, stands just north of Thurmont off US 15 where Roddy Creek Road meets Roddy Road at Owens Creek; it is the smallest of the county's covered bridges, a single-span Kingpost design measuring 40 feet long. Loys Station Bridge, located on Old Frederick Road just south of Route 77, was first constructed circa 1880 and has been structurally rebuilt, though the bridge's original timbers remain throughout the 90-foot-long structure crossing Owens Creek; it features a multiple Kingpost design. Thurmont, established in 1751 and known as the Gateway to the Mountains, offers scenery, wildlife, wildflowers, historic buildings, hiking trails, scenic drives, camping, and fly-fishing for hikers and bikers exploring Catoctin National Park. Cunningham Falls State Park, west of Thurmont, was named for a 78-foot cascading waterfall and draws visitors for hiking, swimming, picnicking, boating, playgrounds, seasonal camper cabins and campsites, a 43-acre lake, and trails to the falls. Also in the Catoctin Mountains is Camp David, the presidential retreat and getaway for many U.S. Presidents and their diplomatic visitors, and the site of the 2012 G-8 Summit. Thurmont was named a Main Street Maryland Community in 2005 and continues to focus on the appearance, image, and economy of its business district, serving as home to family-owned businesses, large corporations, schools, churches, restaurants, civic organizations, and historic as well as new housing, all surrounded by fertile agricultural areas and orchards. About 3 miles south of Thurmont, Catoctin Furnace Iron Works grew from a family-owned ironmaking business created by James Johnson in 1774; his partners included his brother Thomas, Maryland's first governor. The works produced stove plates, fire backs, tools, weights, utensils, and other household items, and in the 1780s the Continental Congress contracted the iron works to cast ten inch shells for use in the Revolutionary War. The remaining furnace stack, Isabella, was constructed during the ownership of Peregrine Fitzhugh and was likely named for his daughter, Isabella Hudson Fitzhugh. After 125 years, the furnace ceased operation with the rise of larger businesses and newer technologies, but Catoctin Furnace remains along with many original cottages of the furnace community. The Collier's Log House is a significant example of the simple dwellings occupied by furnace laborers, many of whom were enslaved African Americans and later European immigrants, who produced iron ore and finished products used throughout the late 18th and 19th centuries in the United States. A self-guided tour includes the remaining furnace stack, the Ironmaster's Manor House ruins, the stone church built for iron workers, and the village of Catoctin Furnace. Memorial Park, across from the trolley substation on East Main Street, was planned and erected by Thurmont's citizens in honor of those who fought and gave their lives in the great World War and was dedicated in November 1922. Over the years it has served as a meeting place for memorial services, concerts, and other local events; after being deeded to the Town of Thurmont, it became part of the town park system, and since its dedication it has been rededicated to those who have served in every war since World War I, with marble plaques bearing the names of citizens who served.