赤城(cheng)(cheng)山又(you)稱燒山,在浙江天(tian)(tian)臺(tai)(tai)西北,為天(tian)(tian)臺(tai)(tai)山南門。海拔306.5米(mi),為丹霞(xia)(xia)地貌,是歷代高(gao)僧名(ming)道的修(xiu)身之(zhi)處,濟公活佛故(gu)里。因(yin)山上赤石(shi)屏列(lie)如(ru)城(cheng)(cheng),望(wang)之(zhi)如(ru)霞(xia)(xia),故(gu)名(ming)。山有石(shi)洞(dong)十二以紫云洞(dong)和(he)玉京洞(dong)最(zui)著(zhu)。山頂有赤城(cheng)(cheng)塔,為南朝梁岳陽(yang)王妃所(suo)建。
今“赤城棲霞(xia)起而(er)建(jian)標”,唐李(li)白《夢游(you)天(tian)(tian)姥吟留(liu)別》詩:“天(tian)(tian)姥連天(tian)(tian)向(xiang)天(tian)(tian)橫(heng),勢拔五岳(yue)掩赤城。”《大(da)清(qing)一(yi)統志.臺(tai)(tai)州府一(yi).山川》:“赤城山,在天(tian)(tian)臺(tai)(tai)縣北(bei)六里。’支(zhi)遁《天(tian)(tian)臺(tai)(tai)山銘(ming)序(xu)》:‘住天(tian)(tian)臺(tai)(tai)者(zhe),當由赤城山為道徑。孔(kong)靈符《會稽記》:‘赤城山,土色皆赤,狀似云霞(xia),望之如雉堞。’......舊志,一(yi)名(ming)燒山,西有玉(yu)京洞。道書以為第六洞天(tian)(tian),名(ming)上玉(yu)清(qing)平之夭,即(ji)天(tian)(tian)臺(tai)(tai)之南(nan)門。”
唐(tang)司馬承禎《上清天地宮府圖經(jing)》和杜光庭《洞天福地岳瀆名山(shan)記(ji)》等道書(shu)所據:
第六赤城山洞,號(hao)“上玉清平(ping)山”(《天(tian)地宮府圖(tu)》作“上清玉平(ping)之洞天(tian)),在(zai)唐興(xing)縣(今浙(zhe)江天(tian)臺)。
赤城山古稱道教十大洞(dong)天之六(liu),為一天然洞(dong)穴,洞(dong)深10米,寬7米。洞(dong)內隨(sui)巖(yan)構(gou)造三開間樓房(fang),周圍植(zhi)有松柏(bo),鑿有古井。相傳晉代魏華存(cun)夫人于(yu)此棲(qi)養修真,得黃庭(ting)內外景(jing)二冊自古號曰黃庭(ting)經(jing)(jing),為丹(dan)經(jing)(jing)絕品。