"I liked this place a lot!
One of the best locations I visited so far, at least for me.
It is a former kings palace with a nice garden and a stupa and a buddhistic temple all in one area.
The ticket is 200 Baht, which is fine for the amount of things you get to see.
You are not allowed to take pictures inside the palace though, but in my eyes that is no problem, since the outside was far more picturesque.
For the temple you need to wear appropriate clothes, but they give you some for free, should you need them.
The garden is green and has all sorts of animals/insects, foremost the apes, of course. You need to be a bit careful, since they might try to steal your food or your drinks, but they did not harm me or were aggressive in any way. Just hold your food/drinks tight.
From the three elevated places here you will have an excellent view of the city and the surrounding lands."

Robin Hüwener

"Phra Nakhon Khiri or Khao Wang was originally a palace of King Rama IV. It is located at Klong Krachang Sub-district, Mueang District, Phetchaburi Province. It is situated on top of three consecutive peaks, with the highest peak being 95 meters high. It was originally called “Khao Samon” (Khao Saman). On the eastern shoulder of the mountain is a temple named “Wat Samon”. In 1861, he named it Khao Maha Sawan, which was later changed to Khao Mahaisawan.
King Rama IV ordered the construction of a palace on Khao Mahaisawan in 1859. Chao Phraya Si Suriyawong (Chuang Bunnag), who was later granted the title of Somdet Chao Phraya Borom Maha Si Suriyawong, was the supervisor of the construction, and Phra Phetphisai Srisawat (Thuan Bunnag) was the supervisor. When construction was complete, he named it “Phra Nakhon Khiri”. King Rama IV was very fond of the beautiful weather and scenery of Phetchaburi. He had resided at Phra Nakhon Khiri many times throughout his reign. During the reign of King Chulalongkorn, he ordered the renovation of Phra Nakhon Khiri to be used as a place to receive royal guests from Germany.
After the reign of King Chulalongkorn, no monarch had resided at Phra Nakhon Khiri again. Until the reign of the present King, he had the idea to restore and renovate. The Fine Arts Department announced the registration of Phra Nakhon Khiri as an important national ancient site, carried out the renovation of various royal buildings, and announced the establishment of the Phra Nakhon Khiri National Museum on August 27, 1979 as a memorial museum. All royal utensils received back from the Bureau of the Royal Household and the Ministry of Interior were registered as antiques, conserved, and displayed inside the Phetphumiphairot Throne Hall and the Pramot Mahaisawan Throne Hall.
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• Ticket 200 baht
• Cable Car 50 baht up & 50 baht down(you can choose to walk up or down the hill without cable car)

There're many wild monkeys around the park. Please keep your food inside your bag.

No camera is allowed inside the Museum(Here I've uploaded some of the interior pictures from their official website. You can also buy their book at the information center.)

Ade Ho

"Been there, great Historical park to visit, unfortunately you can’t take pictures or videos inside Rama IV & V house. Very nice trails to walk around the different sites, the day I was there, no services were available just to get water so make sure you bring a bottle or two especially if it’s sunny."

Michel Maynard