TherearetwoancientcastlesitesintheopenwildernessinthenorthwestsuburbofYinchuancity.ThisisthefamouszhenbeibaoancientcityinChina.ThecastleisaculturalrelicprotectionunitinYinchuanCity,andisnowthelocationofWesternChinaFilmandtelevisioncity.
ThetwocastlesweregarrisonfortressessetupintheMingandQingDynastiestopreventtheinvasionofFucheng(YinchuanCity)byvariousnationalitiestothenorthofHelanMountain.Zhenbeibaoalsogotitsname.Thelocalpeoplecallthem"oldcastle"and"NewCastle".Accordingtolocalrecords,theoldfortwasbuiltinthe13thyearofHongzhi(1500),andthenewfortwasbuiltinthe5thyearofQianlong(1740).
Thetwofortresses,onesouthandonenorth,bothfaceeastintheWest.Theoldcastleclosetotheeastsideofthemountainhighwayhasbeencompletelyerodedbythewind,andonlytheremnantwallsandbrokenwallsremain.Thecityis175meterslongintheEastandWestand160meterswideintheSouthandNorth.PassingthroughHuangturoadinthecitytothenorthisthesiteoftheoldcastleurn.Another200meterstothenorthisthenewcastle.Xinbaocityisrelativelycomplete,170meterslongfromeasttowestand150meterswidefromnorthtosouth.Thewallsarerammedwithloessandaremorethan10metershigh.ThereisasemicircleurnintheEastandaslopeonthesouthsideofthegatetoclimbthewall.Thecitywallis5meterswide,withcrenels1.8metershigh.Therewereturretsatthefourcornersofthecitywall,andthebaseoftheturretcanbeseen.
Afterhundredsofyearsofvicissitudes,zhenbeibaohasbecomeatouristlandscapeintheeasternfootofHelanMountainwithitsvigorousandsimplestyle.Withitsuniquemysteriouscharm,ithasarousedthestronginterestofmanyfamousChinesefilmartistsandhasbeenpraisedas"amysterioustreasureland"byartists.