Congaree National Park

Location: South Carolina

Year Established: 2003

Area: 26,545.86 acres (107.4 km2)

Annual Visitors: 120,122

On the Congaree River, this park is the largest portion of old-growth floodplain forest left in North America. Some of the trees are the tallest in the Eastern US. An elevated walkway called the Boardwalk Loop guides visitors through the swamp.