The Church of Agia Marina Thisseion is a historical monument, as well as a point of major tourist interest, with international recognition, in the Centre of Athens. The church is located on the hill of the Observatory and is largely carved into the rock of the southeast corner of the modern modern church. The object of the work is the artistic restoration and promotion of the Holy Temple of Agia Marina Thisseion. Within the framework of the project, the following will be implemented: Fixing a substrate of the frescoes, fixing a painting layer of the frescoes, sealing fresco cracks, color restoration of the frescoes and cleaning the surface of the frescoes of the Holy Temple.