eVolo Magazine, an architecture and design journal with a futuristic bent, has announced the winners of its 2013 Skyscraper Competition, where architects imagine what the skyscrapers of tomorrow will look like. Hundreds of architects entered and offered up concepts for buildings, and they are some of the most science-fictional ideas we've seen in a while. Just a quick sample of some honorable mentions: a skyscraper that floats on a giant balloon, a shield that harnesses heat from volcanoes, and a plan for building cities inside meteorite crash sites.