Many cities or provinces in Thailand are adorned with mountains, both within the city and embracing its outskirts. One such city is 'Kao Wang,' situated in the heart of the town in the Mueang district of Phetchaburi province. Officially known as "Phra Nakhon Khiri," it is more commonly referred to by locals as "Kao Wang." Apart from being a central mountain in the city, atop Kao Wang stands a blend of mid-Rattanakosin architecture. It comprises temples and palaces, making it a must-visit architectural and historical site.

Kao Wang, or Phra Nakhon Khiri, holds invaluable historical treasures for Thailand, with both temples and palaces contributing to its significance. The architecture, a fusion of Neoclassical and Thai-Chinese styles, adds to its allure as an educational tourism destination. Located on the three peaks of "Khao Sam Nok" (also known as "Sam Muen" or "Khao Maha Saman"), which King Rama IV bestowed the name "Khao Maha Sawan," later renamed "Khao Ma Haisawan," locals have affectionately called it "Kao Wang" for generations.

Aside from its architectural wonders, the panoramic views from Kao Wang are breathtaking. Age-old banyan trees and lush vegetation adorn the landscape, while fallen flowers line the pathways. A highlight is standing on the balcony of the "Phra That Chom Phet" shrine, the highest point of Kao Wang, offering a 360-degree panoramic view of Phra Nakhon Khiri and Phetchaburi.

Phra Nakhon Khiri is ideal for educational tourism, open for visits every day without closure. There are two popular routes to ascend Kao Wang or Phra Nakhon Khiri: the current favorite is by rail car, while the traditional route involves climbing stairs. Both routes offer unique experiences, and some prefer a combination of both. However, visitors are advised to beware of monkeys, as many on Kao Wang might attempt to snatch belongings, especially food. The best times to visit Kao Wang are in the mornings and evenings when the sun isn't scorching, allowing for a leisurely exploration of its architecture.