Founded in the fifteenth century, planned and rebuilt by the French, and then modernised and expanded in the era after independence, the city of Phnom Penh displays a diverse mix of styles. Here, early religious and vernacular buildings, the glittering structures of the Royal Palace, and colonial buildings of the French Protectorate (1863-1953) coexist with the gems of the 'New Khmer Architecture' of the 1960s. After the destructive period under the Khmer Rouge, the city went through a rebirth. It has seen rapid modernisation and economic development in recent years, and its urban landscape is transforming at a breathtaking pace. This guide offers a comprehensive overview of Phnom Penh's built heritage, highlighting its history and architectural layers.