It stands on the south side of a large parade square known as 'Mariblanca' which leads into the courtyard of Royal Palace known as Plaza de Parejas.

Charles III of Spain enlarged the chapel, incorporating a large square cupola with a gable roof.

The church consists of a central circular structure with a grand north-facing portico entrance facade of five white limestone arches decorated with Tuscan pilasters.

The body of the church is circular divided vertically into two levels, each with stone balustrades, one to cap the first-floor level forming a terrace, highlighting the main central circular domed roof which is crowned with a glazed pinnacle.

This information is in the public domain thanks to a declaration of cultural significance published in the official bulletin of Spain on 18 January 2003.