Dorgon established the Qing dynasty as a direct successor of the Ming (delegitimising Li Zicheng and his followers) and Beijing became China's sole capital. The Qing emperors made some modifications to the Imperial residence but, in large part, the Ming buildings and the general layout remained unchanged. Facilities for Manchu worship were introduced, but the Qing also continued the traditional state rituals. Signage was bilingual or Chinese. This early Qing Beijing later formed the setting for the Chinese novel ''Dream of the Red Chamber''. Northwest of the city, Qing emperors built several large palatial gardens including the Old Summer Palace and the Summer Palace.