This 17th-century church, known for its stunning frescoes, is hidden in the heart of the Malasaña neighborhood. The walls and dome are entirely painted in the Spanish Baroque style by masters Francisco Ricci and Juan Carreño de Miranda. Another unique feature is the church's oval shape. Despite its grandeur, it remains little known among tourists.

Opening hours: 10:00 – 17:00
Entry fee: €10