45. Indiana: Indiana Dunes National Park
Located along the southern, sweeping curve of Lake Michigan, Indiana Dunes is an incredibly biodiverse coastal environment located just an hour by train from Chicago. The park features towering, shifting sand dunes (including the famous Mount Baldy), wide sandy beaches, and striking natural trails that transition from beach grass to ancient oak forests. The surprisingly warm summer lake waters and the sheer scale of the dune formations make it a premier Midwestern destination for hiking, swimming, and ecological exploration.
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