Located in Bangkachao sub-district, King Nangklao commanded the construction of this site by Phra Khlang on January 9, 1834. The materials used were salvaged from the ancient city of Chanthaburi to build a fortress aimed at defending against invasions from the Vietnamese. Cannons were strategically placed along the fortress walls, and within the fort, you can find the City Pillar Shrine dedicated to King Taksin the Great, as well as the Wat Yothanimit, which serves as the city’s main temple. Today, this site houses the Department of Underwater Archaeology under the Fine Arts Department, which is responsible for preserving artifacts and pottery retrieved from the Australian Tide ship, which illegally intruded into Thailand's waters to smuggle antiquities abroad. Additionally, the National Maritime Museum is established here, providing a venue for research on the history of the social, economic, and natural sciences, as well as the lifestyles and cultural heritage of Chanthaburi. The museum also showcases evidence relating to Thailand's maritime commerce. The historical site of Nern Wong Fort in Muang District, Chanthaburi, is open for public visits from Wednesday to Sunday, from 9:00 AM to 4:00 PM, and is closed on Mondays, Tuesdays, and public holidays. Admission fees are 20 baht for Thai citizens and 100 baht for foreigners. For more information, please call 0 3939 1431.