About 2km Southeast Of The Forbidden City Towers Tian Tan, Or The Temple Of Heaven, Where Dynastic Rulers In China Used To Worship The Heaven. The Temple Plus Subsidiary Buildings And A Surrounding Garden Covers An Area Five Times The Size Of The Forbidden City. As Chinese Emperors Called Themselves Tianzi, Or The Son Of Heaven, They Had To Cede Supremacy To The Heaven In Terms Of Abiding. Photo