Tiandanger gate is the gate on the south side of guan City. It is the first gate of Guan South. It is 12.5 meters high. The main body of the building was built in Ming Dynasty, and the incomplete part was renovated in 2010 to restore the style of the Ming Dynasty. The door above the forehead plaque book engraved "heaven risk" two words. The blue SLATE in the doorway is the original thing of Ming Dynasty, and the clear ruts between 600 years witness the glorious past of Yanmenguan.
The building on the door, also known as the wild goose floor. The original building was destroyed in 1937. The existing main body was rebuilt in 1989 and repaired in 2010. Wild goose floor width 5, deep 4. Building empty chang, the main function in history is for soldiers to patrol, lookout, is now yanmenguan ancient architecture museum.