ridgeline of eroded peaks on the castle trail

america american landscape scenic arid badlands national park castle trail dry eroded formation erosion geological geology great plains hiking holiday natural nature north outdoors outside path prairie rock solitude tourism travel trekking usa vacation alone destination grassland horizon one scenery view wild wilderness ridgeline peaks south dakota alone america american landscape scenic arid badlands park trail destination dry formation erosion geology grassland plains hiking holiday horizon natural nature one outdoors outside path prairie scenery solitude tourism travel trekking usa vacation view wild