The world's cities are growing at a faster rate than ever before. An estimated 75 million people around the world move to an urban area every year. And as our metropolises become more and more crowded, architects, designers and builders face a constant challenge: How to create new and modern spaces in cities where every square-inch has already been developed.

Streaming video file encoded with permission for digital streaming by Infobase on October 29, 2015.

Introduction: Concrete Jungle: How Cities Work --(1:11) -- The Walkie Talkie -- (10:08) -- Vegas Window Washers -- (5:52) -- Serpentine Gallery Pavilion -- (7:14) -- Rincon Tower -- (6:17) -- London Demolition -- (5:46) -- The High Line -- (2:47) -- Stockholm Safe House -- (6:11) -- Crossrail Project -- (3:38) -- Credits: Concrete Jungle: How Cities Work -- (1:03).