The atmospheric Atrium (closed room) of Gaia Center (entrance from 100 Othonos street), sunny, bright and impressive as construction by all respects, hosts the "Geosphere", a dome with a diameter of 5 meters and an area of 40 square meters. The place can host business or social banquets, up to 400 persons (seated) or more than 500 at a buffet event. It offers about 100 underground parking spots and it provides all the necessary facilities to people with disabilities.