At the heart of Angkor Thom is the 12th-century Bayon, the mesmerising, if slightly mind-bending, state temple of Jayavarman VII. It epitomises the creative genius and inflated ego of Cambodia’s most celebrated king. Its 54 Gothic towers are decorated with 216 gargantuan smiling faces of Avalokiteshvara, and it is adorned with 1.2km of extraordinary bas-reliefs incorporating more than 11,000 figures.