A Knight's Tale HBO, 9pm Heath Ledger (above) plays a poor and humble squire who sees an opportunity to disguise himself as a knight and decides to maintain the illusion for as long as possible. A rousing adventure comedy with a soundtrack that includes songs from Queen and David Bowie. Angkor: The Lost City Pearl, 8.35pm At its height Angkor in northern Cambodia was a great city. Constructed over hundreds of years from around 800 AD, it was the capital of an empire that held sway over much of Southeast Asia. However, when Portuguese explorers stumbled across the city's ruins in the 16th century it was already engulfed by trees. For years, archaeologists believed that the Khmer kings simply lost their grip on power but new findings have begun to challenge that view.