This place is enormous. And crowded. Make sure to allocate enough time, & preferably do it first thing. Also be sure to wander off to the sides, & visit the various exhibitions - ceramics, stone drums, jade etc. (make sure your ticket covers these as well as main entry). If you have a private guide, discuss what you want to see with your guide before going, as many tours only cover the main pavilions up through the centre, which after a while can get very wearisome due to the huge crowds - & it was not very busy when we were there! The gardens & halls off to the sides are very peaceful - not many people seem to venture there, but the exhibitions are very interesting.
Although it seems to make sense to visit Tian'anmen Square before crossing the road to the Forbidden City, do it afterwards or preferably on another day. It is worth it to get to the Forbidden City before the big tour groups, which will eventually drive you mad.
The Palace Museum (The Forbidden City) is directly across the street from Tienanmen Square. The traditional entrance to the Forbidden City complex is from the southern end, right by the picture of Mao Zedung. The Forbidden City is set out as a series of buildings/halls on the north/south axis. Each of these major buildings has a courtyard area and smaller buildings perpendicular on both the right and left sides. The "City" is said to contain 800 buildings and over 8,000 rooms. Even though not all of them are open to the public it will still take up a good portion of your day to view this site. The buildings are more and more impressive as you travel in this direction through the "City". After the last building you will find the Imperial Garden which contains very old cypress trees and plantings. Just past this you will see the fake "mountain". Apparently, a mountain to the north of a residence is good feng shui, however the Forbidden City does not have a mountain nearby so one was built.
Beijing forbidden city is a very famous tourist attractions now, and beijing forbidden city tour is low price. During forbidden city tour you can feel history of China. in a word forbidden city beijing if you come here it never let you down!