The grand prize when to Riesgo, a visualization of flood hazard in the Philippines by Briane Paul V. Samson and Unisse C. Chua, who have a nice write-up with tons of details. It's a delightful project built with ReactJS and Mapbox. I even like the 3D map in the opening because the height of the bars isn't the only encoding to show elevation (that'd make it confusing); Samson and Chua also used color shade, so the map is quite clear.
You can see all other winners and submissions here. Living in Florida, I was particularly interested in this visualization of the impacts of hurricane Maria in Dominica (article). Also, this story about the aftermath of the 2015 earthquake in Nepal is quite well done.
