Visitors to the Forbidden City usually go in by the Meridian Gate and come out by the Gate of Divine Prowess.
Tips
history
It was built in 1420 as the 玄武门, after 玄武, the Black Tortoise of the north. Under the Kangxi emperor it was renamed, because his personal name 玄烨 made 玄 taboo. 景山 Park rises just across the road.