El Greco decorated altars in a number of churches. One of them, in the church of Santo Domingo el Antiguo in Toledo, he decorated with sculptures; in other cases El Greco designed the frame of the altar itself.
The artist was very interested in architecture and even wrote a treatise on this subject. Unfortunately, both these treatises disappeared without a trace.
Related Paintings
El altar de la iglesia de Santo Domingo el Antiguo en Toledo – El Greco 
Autel de l’église de Santo Domingo El Antiguo à Tolède – El Greco 
Toledo by El Greco 
View and plan of Toledo by El Greco 
Oración de Santo Domingo – El Greco 
Resurrection by El Greco 
View of Toledo by El Greco 
Immaculate Conception by El Greco