great sand dunes national park

abstract adventure america barren beauty big black climate clouds colorado day daytime desert destination drift drought dry dune dunes ecology environment escape exploration explore freedom gray great grey heat hike hiking hills horizon hot landscape liberty monochromatic monochrome mountains national nature nobody outdoor outdoors panoramic park pattern patterns piles plain preserve reserve ridges ripples rural sand sandy savage scenic shapes sky space states sun sunshine texture tourism travel trek united usa vacation valley waves west western white wild windblown