This 2023 astronaut photo shows a series of slowly moving "star dunes" in the Erg Chebbi region of Morocco. Most of these massive structures are likely several centuries old.

Nature's Icy Masterpiece Tucked away in the frozen waters of Lake Superior, the Apostle Islands Ice Caves in Wisconsin are a ...

Monument Valley, Arizona/Utah Monument Valley, straddling the Arizona-Utah border, is an iconic symbol of the American West.