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

This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

A unique combination of sand and snow transformed a Colorado national park into an otherworldly winter wonderland, a stunning ...

In the summers, beachgoers can enjoy a sunset stroll. In the frosty winters, they can witness the unparalleled beauty of Lake Michigan. The park, known for its rare ecosystems and towering sand dunes, ...