Constructed in gleaming limestone around AD 5, this temple was built to honour Emperor Augustus’ two adopted sons. Despite the name, the Maison Carrée (Square House) is actually rectangular – to the Romans, ‘square’ simply meant a building with right angles. The building is beautifully preserved, complete with stately columns and triumphal steps. There's no need to go inside unless you're interested in the relatively cheesy 22-minute 3D film.