The 21st century has not been kind to the water levels in Lake Powell, a meandering reservoir that straddles the border between Arizona and Utah. This series of images, taken by NASA’s Landsat satellites from 1999 to 2015, document the change.
This image, taken by Expedition 41 aboard the International Space Station, looks like the fine artwork of some extra-terrestrial, but it's actually decades old scarred earth and entrenchments of warfare along the Iraq/Iran border.
Since it's basketball bracket season, NASA's Earth Observatory has been running a tournament of its own, putting a year's worth of great satellite images in head-to-head competition. The winner is a stunner.