More than half of us now live in cities. Crowded, chaotic and bursting with life - these are places under pressure. In this brand new series, Dan Snow, Anita Rani and Ade Adepitan go behind the scenes to reveal the hidden systems and armies of people running some of the greatest cities on earth. Find out how Mexico City keeps its inhabitants safe from earthquakes, and meet local people who offer an inside look at life in metropolises like Delhi and Hong Kong. Meanwhile, Moscow's incredible architecture shows that the world's busiest cities also have some of the richest histories.更多《敢死队4》全集在线观看、敢死队4在线高清播放免费观看、敢死队4完整版在线观看相关欧美综艺资源，请持续关注疯狂影迷网!