Indiana Dunes — Lake Michigan's Living Sand Mountains

Two and a half hours northwest of Indianapolis, the flat farmland gives way abruptly to something extraordinary: fifteen miles of towering sand dunes rising off the southern shore of Lake Michigan, backed by rare oak savanna, bog, and marsh. Indiana Dunes National Park protects one of the most biodiverse units in the entire park system, where wind-driven 'living' dunes still march inland and the beaches stretch to a horizon of open freshwater that reads like an ocean. Day one climbs the restless, ever-shifting Mount Baldy and walks the Dune Succession Trail up from beach to forest at West Beach, tracing how bare sand becomes woodland. The night is spent in Chesterton or lakeside Michigan City. Day two takes on the lung-burning Three Dune Challenge in adjacent Indiana Dunes State Park, tours the 1885 Chellberg Farm, and ends along the Michigan City lakefront before the drive home. Note: Mount Baldy's summit has been closed to open public climbing since a 2013 sinkhole incident and is accessible only on ranger-guided hikes when offered — check the National Park's schedule; the Dune Succession Trail and West Beach are the reliable dune-climbing options.