Bukammun (Northern Secret Gate) is one of five secret gates found at Hwaseong Fortress.
It is located in between Dongbukgangnu (Northeastern Angle Tower) and Gakgeondae.
These stone structures were inconspicuous and hidden out of sight. They were also was used by people and animals and to bring war munitions into the fortress.
Construction was completed on March 27, 1796.