Phra Nakhon Khiri Historical Park or “Khao Wang” was a former royal residence constructed under the command of King Rama IV. Situated on the three peaks called Khao Samon or “Samon,” King Rama IV renamed Phra Nakhon Khiri “Khao Mahasawan.” The historical park are divided in these following zones:

Phra Nakhon Khiri National Museum is located within the royal quarter. Thus, displays of artifacts are classified based on each throne hall's significance. They consist of furniture, royal utensils and objects in commemoration of King Rama IV and King Rama V.

Phet Phum Phairot Throne Hall is the largest throne hall of Phra Nakhon Khiri. Influenced by Western, Thai, and Chinese architecture, it was used as King Rama IV's administrative hall. Later in 1910, King Rama V graciously commanded its renovation to turn the place into residence for His royal guests Duke Johann Albrecht, Regent of the Duchy of Brunswick and his spouse Princess Elisabeth of Stolberg-Rossia of Germany. The rooms were renovated into these:

Front main hall              was turned into dining room

Rear main hall               was turned into bedroom

Eastern veranda            was turned into leisure room

Western veranda           was turned into bathroom and toilet

Each room displays a wide array of exquisite royal utensils and decorative items which were the work of the mid-to-late 19th century European art along with Chinese, Japanese, and Persian art. The idea behind the display tried to focus on these items' original purpose of usage and form.

Pramot Mahaisawan Throne Hall was, according to the 25th Article of Annals, “the King's residence.” This two-storey building was constructed in Chinese patio-style and adjacent to Phet Phum Phairot Throne Hall. Its upper level was divided as His bedroom and office.

Other significant historic sites include:

Wetchayan Prasat Throne Hall is a palace with stupa, a popular architectural style during the time of King Rama IV. Inside, a bronze statue of King Rama IV was placed. 

Ratcha Dhamma Sapa Throne Hall is the one-storey structure influenced by Thai, Chinese, and European art. It was formerly used as a prayer hall during the reign of King Rama IV but was transformed into dining room for traveling members of the royal family.

Chatchawan Wiang Chai Tower or the Observatory has a lamp inside. In the old days, fishermen relied on the light from this lamp to guide them back to Baan Laem Coast during nighttime.