This comes from quarried stone areas The Molar or Torrelaguna (Quarries Redueña). It also highlights the beautiful Mudejar covering the nave and the apse of the Gothic vault. The most interesting feature of this temple is undoubtedly its tower, dating from the 12th century except the Herrerian style spire tops, made of slate for the 18th century. It has a square and is constructed of brick decorated with blind arches. The brick has dimensions of 30 x 15 cm in the lower parts, but it was the brick bell tower area are smaller and of a different hue. This tower possibly corresponds to one of the Arab minarets preserved in the city. The tower was transformed in the 14th century, when it changed the cover, which was subsequently replaced by the spire. The church has two entrances, both with jambs and lintels made of granite. The principal is a beautiful cover Baroque carved in the 18th century by Luis Salvador Carmona where is the image of St. Nicholas in a relief. The whole façade is inserted in this cover is made of brick with a layout and dimensions very different from the rest of the building. The other is a semicircular door, inserted in a socket façade masonry flint evolves vertically curbs brick masonry with drawers, which corresponds to the so-called "rigging Toledo", which also promptly displayed a dolomite-limestone masonry Tertiary. This front end on the upper level with three windows and a balcony on brick. See also Catholic Church in Spain List of oldest church buildings Romanesque churches in Madrid References :es:Iglesia de San Nicolás (Madrid) External links Church of San Nicolas de los Servitas Madrid entry Romanesque architecture in Madrid Nicolas Former mosques in Spain Churches converted from mosques Bien de Interés Cultural landmarks in Madrid Buildings and structures in Palacio neighborhood, Madrid