The habit also developed of building garden estates in the countryside surrounding the capital city, where the emperors retired at times to get away from the rigid etiquette of the imperial palace, or simply to escape from the summer heat inside their capital. This practice reached a zenith with the Qing dynasty, whose emperors built the fabulous Imperial Gardens (御園), now known in China as the Gardens of Perfect Brightness (圓明園), and better known in English as the Old Summer Palace. The emperors of the Qing Dynasty resided and worked in the Imperial Gardens, 8 km/5 miles outside of the walls of Beijing, the Forbidden City inside Beijing being used only for formal ceremonies.