Madrid has a large number of churches, some of which are some of the finest works of Spanish religious art. The oldest church that has survived to this day is San Nicolás de los Servitas. Its belfry dates back to the 12th century and is the oldest architectural element of the building.

The remaining parts of the church have been rebuilt many times and come from the period between the 15th and 17th centuries. Another historic and ancient structure is the Church of San Pedro el Real (St Peter the Royal), dating from the 14th century. This building also underwent various renovations over the centuries, mainly in the 17th and 19th centuries. It was then covered with a new facade and portals were added.