Córdoba's bridgehead against Castile Historical milestone · Gormaz, Tierras del Burgo, Soria Image of Gormaz, not of the place itself. For two centuries the fortress of Gormaz was Córdoba's forward base against the County of Castile and changed hands repeatedly; the general Galib rebuilt it between 955 and 966 as the largest caliphal fortress in Europe, with 1,200 meters of wall and 28 towers. siglos X y XI Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in Gormaz