Big cliff hole, door of Yuan Minghong cliff, it is one of ancient Chongqing city gate, be located in Chongqing city to liberate white road of tablet dark blue, two rivers hand in river of ground section chief, Jia Lingjiang those who collect bank river region, it is to hold a sightseeing concurrently travel, recreational go vacationing the travel area that waits for a function. Period of the Warring States (BC 314 years) , qin Zhangyi destroys cling to Ba Jun of the build after the country. Period of the kingdom of Shu Han of the Three Kingdoms (BC 226 years) , li Yan dominant the 2nd fortification on Chongqing history. Chongqing signs of human habitation is exiguous at that time, stone of large-scale exploitation hill is difficult, it is earthy city so. Period of the Southern Song Dynasty (1238) , peng Daya is beat back yuan arms the 3rd fortification, city wall by stone load one's writing with fancy phrases and into. Ming Dynasty Hong Wu 4 years (1371) , dai Ding the 4th fortification, build 9 8 shut seventeen, big cliff door is close the door. Big cliff door is to open the door together formerly, here ever had produced war of a miserable intense. According to " new Wang Shixian passes yuan of history · " account: Wang Wei Yu Zhiyuan 8 years (1271) close with two plain travel Privy Council arms surround Chongqing, seize big cliff door, obtain He Shixian of general of the Song Dynasty. The city zone of clear acting Chongqing delimits cent is 29 lane, make up outside city gate for 15 compartment, area of inland of big cliff door belongs to big cliff lane, the division that adds outline is big cliff compartment. Big cliff door, all through the ages is martial fastness, also be the one big wonderful scenery of Chongqing city. Big cliff hole plays cliff side in the cliff outside big cliff door, it is a tremendous grotto, call Hong Yan hole, immortal hole again. Ancient time of according to legend has an immortal, good-sized Hongya celestial being. Uncut jade of Guo of advance acting learned man ever was written down " right pat Hong Ya shoulder " line, its personate. Hong Ya door is marred already, be located in position of corsair of big cliff hole. Withheld fort of river narrow pass, Hong Ya to shut dock of salt of the door, paper, bright generation the major history such as epitaph of the last of the twelve Earthly Branches of city wall, laborious is vestigial. Condole foot building belongs to column type construction, according to hill make use of condition, edge river and build, building structural frame is simple, agile, form does not have bay formulary, let liberate tablet to arrive directly at Jiang Bin. Along with the condole foot Lou Qun of slope make use of condition, form linear road space, the bottom built on stilts of condole foot building becomes void, upside is surrounded into entity. Big cliff drop is emerald green, big cliff hole takes Ceng Shilin Mu Cangcui, cultivate many store water, then a brook from mountain forest oozy, along big open drain, meeting celestial being bridge flows near big cliff hole all the time, form a fall impending and below, fall to trickling sluggishly brooklet is collected down ground of rock from top to bottom again between cliff. And the season in little rain, water shows bits and pieces to fall toward cliff drop, drip be mirrorred to be appeared by sunshine, if each is green bead jasper, bookman poets people call its " Hong Ya drop is emerald green " .