Phra Nakhon Khiri It is an ancient monument of Phetchaburi Province. The Summer Palace, built during the reign of King Rama IV, is located on top of three large peaks.The most famous ancient monument of Phetchaburi Province and has become a symbol of this province by default. The beauty of Phra Nakhon Khiri has been revealed since the reign of King Rama IV when he traveled to live on top of this mountain. He was more pleased and ordered Chao Phraya Si Suriyawong (Chuang Bunnag) to lead the construction of the palace on the top of the mountain until it was completed in 1860. He gave it the name "Phra Nakhon Khiri", but most locals prefer to call it "Khao Wang" until today. Inside Khao Wang, there are royal residences, temples, and various groups of buildings in neoclassical architecture mixed with beautiful Chinese architecture. Each place is located on top of three peaks: the eastern peak, starting from the foot of the mountain, is where Wat Maha Samanaram is an ancient temple that has been around since the Ayutthaya period. This temple is beautiful with murals by Khrua In Khong. Decorated inside the chapel. On the top of the hill is Wat Phra Kaew, the temple of Phra Nakhon Khiri. It consists of a small chapel decorated with marble. At the back is Phra Phutthasela Chedi. In front is a small rectangular bell tower. On the central hill is the 40-meter-high Phra That Chom Phet, which contains the relics of the Lord Buddha. From this point, you can see various royal residences and the impressive view of Phetchaburi. On the western hill is the royal residence, including Phra Thinang Phet Bhumiphairot, Phra Thinang Pramot Mahaisawan, Phra Thinang Wechayan Wichian Prasat, Phra Thinang Ratcha Thammasapha, Hor Chatchawan Wiangchai, Hor Phiman Phet Mahesuan, Phra Thinang Santhakara Sathan, Hor Chatuwet Paritpachan, Sala Thatsanakkhat Rit. In addition, there is a garage, stable, Sala Mahalek, Sala Luk Khun, Sala Dan, Sala Yen Chai, Thim Dab Ongkrak, and kitchen, just like in a general palace. Around the palace are forts in all four directions: Fort Thattarat Phong Pok in the east; Fort Wirunhokborirak to the south, Fort Wirupak to the west, and Fort Wetsuwanrak to the north. In addition, the Fine Arts Department has used some parts of the palace on the western hilltop to establish the Phra Nakhon Khiri National Museum. Inside, various antiques are kept, including royal regalia of King Mongkut and King Chulalongkorn, bronze and brass figures used to decorate various rooms in the palace, Chinese, Japanese, and European ceramics.