Question: What museum is now housed in the palace built by Nguyễn An and others in the 15th century?

full_context: Document 1: Duan Ning: Duan Ning (段凝) (died November 8, 928?), né Duan Mingyuan (段明遠), known as Li Shaoqin (李紹欽) during the reign of Emperor Zhuangzong of Later Tang (Li Cunxu), was a general of the Chinese Five Dynasties and Ten Kingdoms period states Later Liang and Later Tang. He became an official under Later Liang's founder Zhu Wen (Zhu Quanzhong) based on his sister's being a concubine to Emperor Taizu, and later became a major general during the reign of Later Liang's last emperor Zhu Zhen. The failure in his ambitious plan to counterattack against Later Liang's northern rival Later Tang enabled Later Tang to defeat and conquer Later Liang, but despite such failure, he became a trusted general under Later Tang's founder Emperor Zhuangzong as well. After Emperor Zhuangzong's own fall and death, and succession by his adoptive brother Emperor Mingzong of Later Tang (Li Siyuan), Emperor Mingzong exiled Duan and later forced him to commit suicide.
Document 2: Ou Daren: Ou Daren (1516–1596) was a Ming Dynasty scholar. He was a native of Chencun (陳村), Shunde in Guangdong province. Becoming an official with the Second-Degree Scholars (優貢), he was appointed at posts such as Assistant of the Imperial College (國子監助教), Officer in Ministry of Work Affairs in Nanjing (南京工部虞衡郎中), etc. He was famous for his poetry, and was one of "The Latter Five Poets of the Southern Garden" (南园后五子), along with Liang Youyu, Li Minbiao, Wu Dan and Li Shixing. His famous works are the Collected Works of Ou Yubu (歐虞部集) and the Biographies of Virtuous Ancestors of Bai Yue (百越先賢志).
Document 3: Museum of the Imperial Palace of the Manchu State: The Museum of the Imperial Palace of the Manchu State () is a museum in the northeastern corner of Changchun, Jilin province, northeast China. The Palace was the official residence created by the Imperial Japanese Army for China's last emperor Puyi to live in as part of his role as Emperor of the Japanese puppet state of Manchukuo. In the People's Republic of China the structures are generally referred to as the Puppet Emperor's Palace & Exhibition Hall. It is classified as a AAAAA scenic area by the China National Tourism Administration.
Document 4: Cheng Yuanzhen: Cheng Yuanzhen (程元振) (died 764?) was a eunuch official of the Chinese dynasty Tang Dynasty. He was exceedingly powerful early in the reign of Emperor Daizong and was said to, in his attempts to consolidate his power, have killed or demoted a number of key generals and officials on his own whim, and thus drew the hatred from the other officials and generals. In 763, he was blamed for not warning Emperor Daizong about the Tubo invasion that eventually caused the capital Chang'an to fall to Tubo forces, forcing Emperor Daizong to flee. Emperor Daizong exiled him, and he died in exile.
Document 5: Ming dynasty: The Ming dynasty was the ruling dynasty of China – then known as the Empire of the Great Ming – for 276 years (1368–1644) following the collapse of the Mongol-led Yuan dynasty. The Ming, described by Edwin O. Reischauer, John K. Fairbank and Albert M. Craig as "one of the greatest eras of orderly government and social stability in human history", was the last imperial dynasty in China ruled by ethnic Han Chinese. Although the primary capital of Beijing fell in 1644 to a rebellion led by Li Zicheng (who established the Shun dynasty, soon replaced by the Manchu-led Qing dynasty), regimes loyal to the Ming throne – collectively called the Southern Ming – survived until 1683.
Document 6: Heian Palace: The Heian Palace (平安宮 , Heian-kyū ) or Daidairi (大内裏 ) was the original imperial palace of Heian-kyō (present-day Kyoto), the capital of Japan, from 794 to 1227. The palace, which served as the imperial residence and the administrative centre of for most of the Heian period (from 794 to 1185), was located at the north-central location of the city in accordance with the Chinese models used for the design of the capital.
Document 7: Kuai Xiang: Kuai Xiang (; 1398–1481) was a Chinese architect and engineer widely known as designer of the Forbidden City and originator of the Xiangshan Carpenters. He was born in Xukou (Xiangshan), Wu County, Suzhou during the Ming Dynasty. When the Yongle Emperor decided to transfer the capital from Nanjing to Beijing in 1407, Kuai Xiang was ordered to design and construct the Forbidden City for him.
Document 8: Summer Palace: The Summer Palace (), is a vast ensemble of lakes, gardens and palaces in Beijing, China. It serves as a popular tourist destination and recreational park. Mainly dominated by Longevity Hill () and Kunming Lake, it covers an expanse of 2.9 km2 , three-quarters of which is water.
Document 9: Jianwen Emperor: The Jianwen Emperor (; 5 December 1377 – 13 July 1402) was the second emperor of the Ming dynasty in China. His personal name was Zhu Yunwen (朱允炆 ). The era name of his reign, "Jianwen", means "establishing civility" and represented a sharp change in tone from "Hongwu" ("vastly martial"), the era name of the reign of his grandfather and predecessor, the Hongwu Emperor. His reign did not last long: an attempt to restrain his uncles led to the Jingnan rebellion. The Jianwen Emperor was eventually overthrown by one of his uncles, Zhu Di, who was then enthroned as the Yongle Emperor. Although the Yongle Emperor presented a charred body as Zhu Yunwen's, rumours circulated for decades that the Jianwen Emperor had disguised himself as a Buddhist monk and escaped from the palace when it was set on fire by Zhu Di's forces. Some people speculated that one of the reasons behind why the Yongle Emperor sponsored the admiral Zheng He on his treasure voyages in the early 15th century, was for Zheng He to search for the Jianwen Emperor, who was believed to have survived and fled to Southeast Asia. Some historians believe that the Jianwen Emperor had indeed survived and escaped from Nanjing, but the official histories of the Ming dynasty were modified later during the Qing dynasty to please the Manchu rulers.
Document 10: Forbidden City: The Forbidden City was the Chinese imperial palace from the Ming dynasty to the end of the Qing dynasty—the years 1420 to 1912. It is in the center of Beijing, China, and now houses the Palace Museum. It served as the home of emperors and their households as well as the ceremonial and political center of Chinese government for almost 500 years.
Document 11: Mimar Sinan: Koca Mi'mâr Sinân Âğâ (Ottoman Turkish: معمار سينان‎ , "Sinan Agha the Grand Architect"; Modern Turkish: Mimar Sinan, ] , "Sinan the Architect") ( 1489/1490 – July 17, 1588) was the chief Ottoman architect (Turkish: "mimar" ) and civil engineer for sultans Suleiman the Magnificent, Selim II, and Murad III. He was responsible for the construction of more than 300 major structures and other more modest projects, such as schools. His apprentices would later design the Sultan Ahmed Mosque in Istanbul, Stari Most in Mostar, and help design the Taj Mahal in the Mughal Empire.
Document 12: Tokyo Imperial Palace: The Tokyo Imperial Palace (皇居 , Kōkyo , literally "Imperial Residence") is the primary residence of the Emperor of Japan. It is a large park-like area located in the Chiyoda ward of Tokyo and contains buildings including the main palace (宮殿 , Kyūden ) , the private residences of the Imperial Family, an archive, museums and administrative offices.
Document 13: Old Summer Palace: The Old Summer Palace, known in Chinese as Yuanming Yuan (), and originally called the Imperial Gardens (), was a complex of palaces and gardens in present-day Haidian District, Beijing, China. It is located 8 km northwest of the walls of the former Imperial City section of Beijing. Constructed throughout the 18th and early 19th centuries, the Old Summer Palace was the main imperial residence of Qianlong Emperor of the Qing dynasty and his successors, and where they handled state affairs; the Forbidden City was used for formal ceremonies. Widely conceived as the pinnacle work of Chinese imperial garden and palace design, the Old Summer Palace was an architectural wonder, known for its extensive collection of garden, its building architecture and numerous art and historical treasures. It was reputed as the "Garden of Gardens" () in its heyday.
Document 14: 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.
Document 15: Atik Sinan: Sinan-i Atik, also known as Azadlı Sinan, and Atik Sinan (meaning Sinan the Freedman; azadlı shows that atik does not mean old, and is not used to distinguish him from Koca Mimar Sinan Agha), was an Ottoman architect for Sultan Mehmed II from the empire's Greek community during the 15th century.
ground_truth: Palace Museum