Full circle rainbow captured over Cottesloe Beach near Perth, Australia in 2013 by Colin Leonhardt of Birdseye View Photography. He was in a helicopter flying between a setting sun and a downpour. Used with permission.
In pics: Storm chaser Chris Allington photographs extreme weather conditions
Steam Towers - Iceland - The area of Hverir is incredibly geothermally active, so much so that ghostly towers of steam and gas rise from bodies of water and mud as they boil. Combined with the Northern Lights, this place looks like an alien world.