赤城(cheng)山(shan)(shan)又稱燒山(shan)(shan),在(zai)浙江天臺西北,為天臺山(shan)(shan)南門。海拔306.5米,為丹(dan)霞地貌,是歷代高僧名道的(de)修(xiu)身(shen)之處,濟公活佛故(gu)里(li)。因山(shan)(shan)上赤石(shi)屏(ping)列如(ru)城(cheng),望之如(ru)霞,故(gu)名。山(shan)(shan)有(you)石(shi)洞(dong)十二(er)以紫(zi)云洞(dong)和玉京(jing)洞(dong)最著(zhu)。山(shan)(shan)頂有(you)赤城(cheng)塔,為南朝梁岳陽(yang)王妃所建。
今“赤城(cheng)(cheng)棲霞起(qi)而建(jian)標(biao)”,唐李白《夢游天姥(lao)吟留別》詩:“天姥(lao)連天向天橫(heng),勢拔五岳掩赤城(cheng)(cheng)。”《大清一(yi)統志(zhi).臺(tai)(tai)(tai)州府一(yi).山(shan)(shan)川》:“赤城(cheng)(cheng)山(shan)(shan),在(zai)天臺(tai)(tai)(tai)縣北六里。’支(zhi)遁《天臺(tai)(tai)(tai)山(shan)(shan)銘序》:‘住天臺(tai)(tai)(tai)者,當由(you)赤城(cheng)(cheng)山(shan)(shan)為(wei)道徑。孔靈符《會稽記》:‘赤城(cheng)(cheng)山(shan)(shan),土色皆赤,狀似云霞,望之(zhi)(zhi)如雉(zhi)堞(die)。’......舊志(zhi),一(yi)名燒山(shan)(shan),西有玉京洞。道書以為(wei)第六洞天,名上玉清平之(zhi)(zhi)夭,即天臺(tai)(tai)(tai)之(zhi)(zhi)南(nan)門。”
唐(tang)司馬承禎《上清天地(di)宮(gong)府圖經(jing)》和杜光庭《洞天福地(di)岳瀆名山記》等道書所據(ju):
第六赤(chi)城山(shan)洞(dong),號“上(shang)玉清平山(shan)”(《天(tian)地宮府圖》作“上(shang)清玉平之洞(dong)天(tian)),在唐(tang)興縣(xian)(今浙江天(tian)臺(tai))。
赤城山古(gu)稱道教十大洞(dong)天之六,為(wei)一天然洞(dong)穴,洞(dong)深(shen)10米(mi),寬7米(mi)。洞(dong)內隨巖(yan)構造三開間樓房,周圍植有(you)松柏,鑿有(you)古(gu)井。相傳晉(jin)代魏華(hua)存夫人于(yu)此棲養修真(zhen),得黃庭(ting)內外景二冊自古(gu)號曰(yue)黃庭(ting)經,為(wei)丹經絕品。