What are the four royal libraries in China? Where is the Siku Quanshu hidden?

The Song Building in Lu Xinyuan, Zhejiang, the 8,000-volume Building in Zhejiang, the Haiyuan Pavilion of Yang and his son in Shandong, and the Bronze Sword Building of Qu's family in Jiangsu are called the "Four Treasures of the Late Qing Dynasty". Sikuquanshu was written by Emperor Qianlong in the thirty-seventh year of Qing Dynasty (AD 1772) to collect credentials, and it was established the following year. More than 360 officials below ministerial level participated in leadership and compilation, and 3,466 people participated in copying and binding. During the forty-six to forty-eight years of Qianlong (A.D. 1782- 1783), it took about ten years to complete four works, which were collected in Wenyuan Pavilion specially built in the Forbidden City, Wenyuan Pavilion in Yuanmingyuan, Wenze Pavilion in Rehe Summer Resort and Wenshui Pavilion in Shengjing. Shortly thereafter, Gan Long ordered the reproduction of three films, which were collected in the Longwen Pavilion in Zhenjiang, Yangzhou, Wen Hui Pavilion and Hangzhou, respectively. Wen Hui and Wen Cong were destroyed in the war during the Taiping Heavenly Kingdom in these seven handwritten books "The Imperial Collection of Si Ku Quan Shu". Wen Yuan and Yuanmingyuan were burned by the British and French allied forces together; Wen Lan lost nearly half of it, but it was later copied, and now it is still hidden in Hangzhou. The other three parts are basically completed. Yuan Wen was transported by the Kuomintang government to Shanghai, Chongqing and finally to Taiwan Province Province. Jin Wen is now in Beijing Library. Wenxun has been in Shenyang since liberation. It was transported to Lanzhou in 1966 and kept by Gansu Provincial Library. Due to the different compilation time and the different standards of the officials in charge of compilation, the number of categories, albums and volumes of the three books are slightly different.