Quartz (qz.com) is a news and current affairs site that is an off-shoot of The Atlantic. They have had some of the most interesting visual design on the web in the past couple years. They are definitely pushing what it means to publish and present digital content today. The newest redesign pushes things even further. I love their simple approach. A lot of the interactions and options are so obvious they make you feel dumb that you haven't thought of them first.