World's Busiest

Hong Kong International is sited on a man-made island in the middle of a typhoon zone and handles a fifth of the world's air freight, as well as 53 million passengers every year. This documentary looks at the people and the processes that keep the airport functioning, including the automated tracking devices holding records of where every package is stored in the six-storey warehouse and the work of the air-traffic and ground controllers.

Behind the scenes at San Ysidro, the main border crossing between Mexico and the United States, which is used by more than 40 million motorists and pedestrians each year. The documentary follows the authorities that patrol the boundary, including port director Frank Jaramillo and secondary team member Officer Baumsteiger, who rely on a variety of methods in their mission to stop the flow of illegal immigrants, drugs and other contraband items between the two countries.

Documentary going behind the scenes at the Venetian Palazzo hotel in Las Vegas. In addition to over 7,000 rooms and America's highest grossing restaurant, the Palazzo boasts gondolas, canals and three theatres. In fact, it gets more visitors every year than Venice itself. This programme meets some of the 8,500 staff who keep things running smoothly.

Tokyo is perhaps the world's most crowded city, with 36 million residents, as well as commuters and visitors, all jostling for space. Every 24 hours, three million people pass through Shinjuku Station, where a train arrives every three seconds on one of 35 platforms. 25,000 trains roll through Shinjuku every day, which, were they placed end to end, would stretch from London to New York. With both overground and underground platforms, it is 15 times busier than London Waterloo, the busiest station in Britain. As well as the pressure of rush hour, the site must be prepared for the threat of earthquakes, typhoons and terrorists, and hundreds of staff sleep in pods equipped with inflatable-mattress alarms to ensure they are on time when the doors open at 4am.