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WikiPedia: León_Viejo http://www.vianica.com/sp/activity/10/visitando-la... http://www.arqueotur.org/yacimientos/sitio-arqueol... http://www.manfut.org/leon/complejo.html //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/20160304025712/http://... https://whc.unesco.org/en/list/613rev