Just after entering into the Forbidden City, there's a little canal with five pretty arched bridges over top.
The link below will lead you to a brief description of many parts of the Forbidden City. Here's a bit about these bridges: "The five bridges were supposed to represent the five virtues preached by Confucius: benevolence, righteousness, propriety, intelligence and fidelity. The function of the river was for draining the rain water away, fire prevention and construction on the Forbidden City." http://www.wikibeijing.com/sight/5538bc0ac0450df8304f69ab
