Archaeologist Pauline Carroll travels to Cambodia to explore temple sites and discover lost cities. She visits the world's largest temple, Angkor Wat, and then travels to the Cambodian jungle to discover more about the roots of the Khmer Empire.

Pauline Carroll explores Cambodia, home of the ancient Khmer Empire and learns about the empire's greatest king, and how he established the world's first free national health service. She then visits a mysterious city still being uncovered.

Pauline visits Banteay Toap, a lost city unknown to archaeology until recently. She travels to the Khmer Empire's birthplace in the hills of Phnom Kulen, and returns to Angkor to investigate how this once great civilisation finally fell into decline.