Inside the 'zombieland' airport where hundreds of homeless now live

Inside the 'zombieland' airport where hundreds of homeless now live. A 'hidden city' of the homeless has been allowed to balloon over the past 10 years inside the Madrid-Barajas airport in Spain. Numbers have spiked from around 50 to 500 taking up residence in Terminal Four at the airport frequented by thousands of Brits every years.