Basilica of San Miguel

The Arzobispal Castrense church was designed by the architect Juan Gómez Mora in the year 1615. The construction of the church began in 1671, half a century after the convent was founded; 73 years was spent in its construction, ending in 1744. The church is now commonly referred to as the Armed Forces Army Cathedral.

The Cathedral of the Armed Forces is the cathedral of the Military Ordinariate in Spain. The church was originally part of the former Bernardine monastery of Madrid, founded in 1615 by Cristóbal de Sandoval y Rojas, Duke of Uceda. The church was designed in the shape of a Latin cross by the architect Juan Gómez de Mora in 1615, but construction began in 1671, half a century after the foundation of the monastery, due to the misfortune of the favourite, and was not completed until 1744. The convent was demolished in 1972. The church was therefore purchased by the Spanish Ministry of Defence around 1980 to house the Military Ordinariate in Spain.

The collegiate church of San Isidro, also known as the Colegiata de San Isidro el Real, was built in the 17th century by the architect Pedro Sánchez. The church, built as the church of the former Imperial College of the Society of Jesus, replaced the sixteenth-century parish church of St. Peter and St. Paul, which was demolished, as well as the original Imperial College. In 1885, with the constitution of the Diocese of Madrid, it became the provisional cathedral of that city, a rank that it occupied for more than a century until 1993, when the present Cathedral of Santa María de la Almudena was completed and San Isidro regained its status as a collegiate church. In 1936 the building was burnt down at the outbreak of the Spanish Civil War and then restored.