Just outside Arches National Park in Utah, United States, lies a natural wonder that rises like a colossal doorway against the sky, drawing photographers, nature lovers and hikers. Welcome to Corona Arch, seen in today"s image, a towering Navajo sandstone formation that offers big adventure without the big crowds. The Corona Arch Trail starts off easy but packs a punch of scenery: railroad tracks, slickrock scrambles and even a metal cable assist make it more than just a walk in the desert. After a 2.4-kilometre walk, the payoff is big: a massive arch that"s 43 metres wide and 32 metres high. It"s so large that people once swung from it on ropes, until that was banned for safety reasons.