Every December 23rd on the Chinese lunar calendar, something extraordinary happened in Beijing. The emperor — the Son of Heaven, the man who ruled all of China under the mandate of cosmic order — would leave his palace in the dead of night and walk barefoot to a special temple outside the city walls. There, in cold and darkness, he would kneel alone before an altar and offer a prayer. The subject of that prayer was simple and terrifying: he was asking Heaven to forgive his failures and to spare his people from disaster in the coming year.

That prayer took place at the Temple of Heaven (天坛, Tiāntán), and the ritual was one of the most important duties of the Chinese emperor. If you’re visiting Beijing today, you can walk the same paths and stand in the same spaces where emperors performed this ceremony for nearly 500 years. The Temple of Heaven is one of the most architecturally distinctive and symbolically rich sites in China — a place where every detail was designed to communicate the emperor’s role as a bridge between the human world and the divine order of the cosmos.