赤(chi)城山(shan)(shan)又稱燒山(shan)(shan),在浙江天(tian)(tian)臺西北,為(wei)天(tian)(tian)臺山(shan)(shan)南(nan)門。海拔306.5米,為(wei)丹霞地貌,是歷代高僧名道的修身之(zhi)處,濟公活佛故(gu)里(li)。因山(shan)(shan)上赤(chi)石(shi)屏列如(ru)城,望之(zhi)如(ru)霞,故(gu)名。山(shan)(shan)有(you)石(shi)洞十二以紫云洞和玉京洞最著。山(shan)(shan)頂有(you)赤(chi)城塔,為(wei)南(nan)朝梁岳陽王(wang)妃所(suo)建。
今“赤城(cheng)(cheng)棲霞起而(er)建標”,唐李白《夢游天(tian)(tian)(tian)姥吟留別》詩(shi):“天(tian)(tian)(tian)姥連(lian)天(tian)(tian)(tian)向(xiang)天(tian)(tian)(tian)橫,勢(shi)拔五岳掩赤城(cheng)(cheng)。”《大清一(yi)統志.臺州(zhou)府一(yi).山(shan)(shan)(shan)川》:“赤城(cheng)(cheng)山(shan)(shan)(shan),在(zai)天(tian)(tian)(tian)臺縣北六(liu)里(li)。’支(zhi)遁《天(tian)(tian)(tian)臺山(shan)(shan)(shan)銘序(xu)》:‘住(zhu)天(tian)(tian)(tian)臺者(zhe),當(dang)由赤城(cheng)(cheng)山(shan)(shan)(shan)為(wei)道(dao)徑。孔靈符(fu)《會稽記》:‘赤城(cheng)(cheng)山(shan)(shan)(shan),土(tu)色(se)皆赤,狀似云(yun)霞,望(wang)之(zhi)如雉堞(die)。’......舊(jiu)志,一(yi)名燒(shao)山(shan)(shan)(shan),西有玉京洞。道(dao)書以(yi)為(wei)第六(liu)洞天(tian)(tian)(tian),名上玉清平之(zhi)夭,即天(tian)(tian)(tian)臺之(zhi)南門。”
唐(tang)司馬承禎《上(shang)清天地(di)宮(gong)府圖經》和杜光庭(ting)《洞天福地(di)岳瀆(du)名(ming)山記(ji)》等(deng)道書所據:
第六赤城(cheng)山(shan)洞,號“上玉清平山(shan)”(《天地宮府圖》作“上清玉平之(zhi)洞天),在唐興縣(今(jin)浙(zhe)江天臺)。
赤城山古(gu)稱道(dao)教十大洞(dong)天(tian)之六,為一天(tian)然洞(dong)穴,洞(dong)深(shen)10米(mi),寬7米(mi)。洞(dong)內(nei)隨巖構造(zao)三(san)開間樓房,周(zhou)圍植有松柏,鑿有古(gu)井。相傳(chuan)晉代(dai)魏華存夫人(ren)于此棲養修真,得黃庭內(nei)外(wai)景二冊(ce)自(zi)古(gu)號曰黃庭經,為丹經絕(jue)品。