The Forbidden City is a perpetual topic of discussion, as its rich history makes its trivia captivating. First, there's Zhu Di, the Forbidden City's builder. He reigned for 22 years, but lived in the Forbidden City for only three. The Forbidden City was completed in 1420, and Zhu Di relocated the capital from Nanjing to Beijing in 1421. He died in 1424. Secondly, the Forbidden City's bricks were sourced from Linqing, Shandong. The Forbidden City has 8,707 rooms, not 9,999. Fourteen Ming and Qing emperors ruled in the Forbidden City during the Ming Dynasty and ten during the Qing Dynasty. Besides the harem and the cold palace, the most mysterious areas of the Forbidden City include the Yuhua Pavilion. The longest reign in the Forbidden City was held by Emperor Qianlong, who reigned for 60 years and then continued as the Supreme Emperor for another four years after his abdication. The shortest-lived emperor to reside in the Forbidden City was Zhu Changluo of the Ming Dynasty, who stayed for just one month. Furthermore, birds never land on the roofs of the Forbidden City. In 1924, Feng Yuxiang expelled the last emperor Puyi from the palace. In October 1925, the Palace Museum was officially established. This year marks the 100th anniversary of the Forbidden City.