Ho Chatchawan Wiang Chai

Ho Chatchawan Wiang Chai is a historic observatory tower located on the central peak of Phra Nakhon Khiri Historical Park (Khao Wang) in Mueang Phetchaburi, Phetchaburi Province. Built during the reign of King Rama IV in the 1860s as part of the hilltop palace complex, it served as an astronomical observatory reflecting the king's interest in science and astronomy. The tower offers panoramic views and is a notable feature of the palace's architectural ensemble.

Visitors can expect a historic brick and mortar observatory tower situated within the Phra Nakhon Khiri palace complex atop Khao Wang hill. The tower is accessible via stairs or the park's cable car and offers an elevated viewing platform with panoramic views over Phetchaburi town, surrounding plains and coastline. The surrounding area includes palace buildings, temples and museum displays in a landscaped hilltop setting with forested slopes.