It is a circular church with an immense dome which is painted in vibrant colours and depicts various old testament figures and the Virgin Mary. a Classicist building from the 18th century, was built on an old convent which legend has was founded by San Francisco de Assisi in the 13th century. This new church was built by King Charles III of Spain;. Inside there are decorative paintings by major artists such as Francisco de Goya, as well as an important art gallery in the cloister.