This book features one hundred of the best unbuilt projects proposed since the turn of the millennium by some of the world's greatest contemporary architects, including Norman Foster, Rem Koolhaas/OMA, Foreign Office Architects, Diller Scofidio + Renfro, and Zaha Hadid, as well as rising stars such as Jürgen Mayer H Architects and Asymptote.Arranged in sections according to function--entertainment spaces, museums, urban plans, education, habitation--the projects are presented in detail through texts that consider the importance of the designs and assess why they weren't built, along with renderings and plans. Many of the more than 600 illustrations have not been seen outside the practices themselves.