What museum is now housed in the palace built by Nguyễn An and others in the 15th century?
Nguyễn An Nguyễn An (Sino-Vietnamese 阮安; died 1453), known in Chinese as Ruan An (pinyin) or Juan An (Wade-Giles), was a Ming dynasty eunuch, architect, and hydraulics specialist between the first and fifth decades of the 15th century. Born in Vietnam, he was taken as tribute from Vietnam to China and later became a eunuch and architect in service to the Chinese emperors. He, along with numerous architects, such as master designers and planners Cai Xin (蔡信), Chen Gui (陳珪), and Wu Zhong (吳中), master carpenter Kuai Xiang (蒯祥), and master mason Lu Xiang (陸祥), was an important builder of the Forbidden City in Beijing.
Côn Đảo Prison Côn Đảo Prison (Vietnamese: "Nhà tù Côn Đảo" ), also Côn Sơn Prison, is a prison on Côn Sơn Island (also known as Côn Lôn) the largest island of the Côn Đảo archipelago in southern Vietnam (today it is in Bà Rịa–Vũng Tàu Province. The prison was built in 1861 by the French colonists to jail those considered specially dangerous to the colonist government. Many of the high-ranking leaders of Vietnam were detained here. It is ranked a special historical relic of national importance by the government of Vietnam. The most famous site in this prison is "tiger's cage" (vi:"chuồng cọp"). The cage covers an area of 5.475 m2, of which the area of cell is 1.408 m2, sunbath room covers 1.873 m2 and other space covers 2.194 m2. The prison includes 120 cells.