CopenHill

This guide to CopenHill in Copenhagen starts with the pitch that won a 2011 design competition: architect Bjarke Ingels and an artists' collective proposed a power plant that would puff a giant smoke ring for every ton of carbon dioxide it released, and even built a working prototype. You'll hear how the plan changed once money and management shifted, and what got built on the site instead once the smoke rings fell through. Listen as you look out from the sloped rooftop, with the plant's furnaces working underneath you.