With storms aplenty this year, Denmark-based design firm Third Nature has proposed a parking garage concept that manages excess water in cities, and more. Called Pop-Up, the parking garage resides underground—with public space on its top, outside section. With heavy rain, the structure collects water and rises up, while building a reservoir below. While still a concept, Pop-Up demonstrates an innovative new way to tackle infrastructure in changing cities. Learn more at PSFK.