The third of Michael Wood's historical journeys takes viewers on a thrilling trek through India, Nepal and Tibet in search of Shangri-La. The tale of the magical valley hidden behind the Himalayas was popularized in the 1930s movie Lost Horizon, but the myth of a secret earthly paradise is much older. To find the truth behind the legend, Wood travels on foot through some of the world's most sacred mountains before finally reaching the fantastic ruins of a lost city, which he believes is the real inspiration behind the myth.