20130128 04579 12agbp572b4430 14er 20060924_dsc00491 2013021102536_n_12agbp572b2297edit alamosa aspen autumn barn black and white blue boreas breckenridge colorado denver dune dunes fall fall foliage fence frost grand junction lakes longs peak maroon bells mesa moon moose mountains national park park county pass pine river rockies rocky rocky mountain rocky mountain national park rocky mountains sand snow south south park springs squirrel summer sunset tree united states wildlife winter yellow yellowstone