Known as a summertime staple, Silver Lake Sand Dunes is open for winter hiking, fat-tire biking, snowshoeing and sledding.

A unique combination of sand and snow transformed a Colorado national park into an otherworldly winter wonderland, a stunning photo shows. The phenomenon occurs about once a week in Great Sand Dunes ...

This landscape of dramatic contrast notably features linear, star and dome dunes as well as several arid granite massifs, some as high as 650 metres. The dunes emerge like islands from the sea of sand ...