First light on Mt. Denali on winter morning40First light on Mt. Denali on winter morningSunrise view from the mountain72Sunrise view from the mountainkhao Sok National Park wildlife24khao Sok National Park wildlifeThese pictures are in a cave, part of which was a dwelling48These pictures are in a cave, part of which was a dwellingPrehistoric rock art on cliffs above Mekong River60Prehistoric rock art on cliffs above Mekong RiverMushroom shaped hoodoos24Mushroom shaped hoodoosWhale Rock at Tidal River70Whale Rock at Tidal RiverPiccaninny Creek, Bungle Bungle Range32Piccaninny Creek, Bungle Bungle RangePurnululu national park40Purnululu national parkOne striking view of Cathedral Gorge60One striking view of Cathedral GorgeAyers Rock - Iconic symbol of aboriginal Australia60Ayers Rock - Iconic symbol of aboriginal AustraliaKata Tjuta (the Olgas), NT, Australia63Kata Tjuta (the Olgas), NT, AustraliaAustralia's "Three Sisters"60Australia's "Three Sisters"Gariwerd at dusk70Gariwerd at duskSouthern Rockhole Waterfall in the famous Katherine Gorge60Southern Rockhole Waterfall in the famous Katherine GorgeView of part of Huascarán National Park. Peru48View of part of Huascarán National Park. PeruBlyde River Canyon  in eastern Mpumalanga, South Africa.50Blyde River Canyon in eastern Mpumalanga, South Africa.Copper Canyon (Mexico): south of Mexico's Grand Canyon54Copper Canyon (Mexico): south of Mexico's Grand CanyonBlack Canyon of the Gunnison National Park60Black Canyon of the Gunnison National ParkWinter colors appear -- not just in winter40Winter colors appear -- not just in winter