The Most HIDDEN Underground Cities

Have you ever imagined a life without the sun? How could we possibly survive? Today we’ll show you how with the most impressive underground cities! 1. GROWING UNDERGROUND, LONDON: In this city located in an old war bunker in London, they managed to sustain a whole farm. This seems almost impossible, however they did it by using a hydroponic, vertical, pesticide-free system. Also, they use the space much more efficiently, saving 70% of the water used on it. 2. EARTHSCRAPER, MEXICO CITY: As you had already