距門(men)源(yuan)縣城(cheng)(cheng)(cheng)50公里(li),該城(cheng)(cheng)(cheng)南(nan)北(bei)(bei)為438米(mi),東(dong)西(xi)為353米(mi),城(cheng)(cheng)(cheng)墻高7.3米(mi),厚6.7米(mi),寬4.3米(mi),外門(men)寬5米(mi),厚10米(mi),頂寬4米(mi);腰樓2座,炮臺8座,城(cheng)(cheng)(cheng)下(xia)壕溝(gou)深1.6米(mi)多,東(dong)西(xi)兩門(men)原各建有(you)(you)(you)門(men)樓,永安河經城(cheng)(cheng)(cheng)西(xi)由北(bei)(bei)向南(nan)流,城(cheng)(cheng)(cheng)東(dong)南(nan)有(you)(you)(you)九道(dao)嶺(ling),嶺(ling)內建有(you)(you)(you)伊斯蘭(lan)教拱北(bei)(bei),河西(xi)有(you)(you)(you)西(xi)鳳山(shan),山(shan)頭有(you)(you)(you)烽火臺,山(shan)中有(you)(you)(you)道(dao)教先(xian)輩修身養心之山(shan)洞(dong)5個,俗稱仙(xian)人洞(dong)。
永安古(gu)城的(de)夏季風景分外嬌(jiao)媚(mei),從城墻上(shang)北望(wang)祁連(lian)山(shan),疊云翠(cui)嶂,嶙峋(xun)連(lian)綿(mian),蒼茫無際,變化無常,令人(ren)(ren)心曠神怡,藍天(tian)(tian)萬(wan)里,白云悠悠,雪(xue)峰下(xia)巖羊驚走(zou),野(ye)兔飛奔(ben),雉雞(ji)突(tu)飛,再加(jia)上(shang)山(shan)坡灘(tan)地(di)高(gao)原特有(you)的(de)金露梅散發著花香,密密麻(ma)麻(ma)的(de)羊群和(he)一(yi)座(zuo)座(zuo)散落的(de)帳篷呈現出雪(xue)域(yu)高(gao)原安靜祥和(he)的(de)一(yi)幅優美(mei)的(de)圖(tu)卷(juan)。城內地(di)域(yu)遼闊,環境優美(mei),賽馬(ma)會經常舉行,一(yi)隊隊青海(hai)良馬(ma)浩(hao)門馬(ma)在(zai)城墻下(xia)健步如飛,揚起(qi)一(yi)路風塵,使人(ren)(ren)感到(dao)有(you)馬(ma)踏飛鷹之(zhi)感,城外九道嶺與西鳳山(shan)相(xiang)望(wang)相(xiang)守,令人(ren)(ren)無限(xian)遐想。永安城一(yi)帶(dai)美(mei)麗的(de)天(tian)(tian)然牧場上(shang)還盛(sheng)養著善走(zou)如飛的(de)良馬(ma)——大通馬(ma),這(zhe)種馬(ma)就是古(gu)代(dai)馳(chi)騁中原戰場的(de)名(ming)駒"青海(hai)驄"。
漢驃騎將軍霍(huo)去(qu)病(bing)一度(du)從(cong)這(zhe)里兵(bing)馬往來,制服匈(xiong)奴(nu),大(da)光五年(nian)(nian)(公(gong)元(yuan)609年(nian)(nian)),隋煬帝(di)統兵(bing)10萬討伐吐(tu)谷(gu)渾,在(zai)城(cheng)北(bei)的覆(fu)袁川一帶大(da)敗吐(tu)谷(gu)渾王伏允,至雍正三年(nian)(nian),清撫遠大(da)將軍年(nian)(nian)羹堯(yao)鎮壓羅布藏丹(dan)增后(hou)派提總兵(bing)王棟筑永(yong)安(an)(an)營,200多(duo)年(nian)(nian)來這(zhe)里一度(du)商人云集(ji),是(shi)雪域繁(fan)華(hua)的商貿重(zhong)鎮。公(gong)元(yuan)1928年(nian)(nian),馬仲英(ying)掀起圍攻河州的戰亂后(hou),同年(nian)(nian)三月抵(di)達永(yong)安(an)(an)城(cheng),并在(zai)永(yong)安(an)(an)城(cheng)大(da)肆擄掠后(hou),隨(sui)即西竄甘肅(su)。從(cong)此(ci),永(yong)安(an)(an)城(cheng)廢棄,現城(cheng)墻基本完好。