What makes a city great? The location? The architecture? The ambience? In this 6 x 50 min series, we circle the globe on a quest to discover the beating heart - and seething underbelly - of the world's most extraordinary cities. Join us as we venture through the grandest old capitals and most modern metropolises on the planet. It's Venice and New York, Hollywood and Bollywood, Cairo, Jaipur, Jerusalem, Rio and more.…