Set in Mumbai's Dharavi slum, superstar Rajinikanth-starrer 'Kaala' was, in fact, shot at a 12 acres campus a few kilometres outside of Chennai, Tamil Nadu. The film set cost a whopping Rs 20 crore, according to insiders. It took three months of research and another three month of hard work by over a thousand people to recreate what is Asia's second largest, and the world's third largest slum.