Egypt green apartment complex to include indoor forests

A solar and wind-powered complex of apartments, shops and offices called The Gate is under construction in Cairo’s Heliopolis, Business Insider reports. Designed by Vincent Callebaut Architectures, the green complex will feature nine cylindrical structures covered in plants, which the designers call "mega-trees”. Construction began in 2014 and will be complete by 2019 (watch, runtime: 00:40).