The facilities cover approximately 150 acres ( 61 hectares ) of land at Aghia Paraskevi on the northern side of Hymettus mountain .
Aghia Paraskevi is a suburb ten kilometers from the center of Athens .
The facilities cover approximately 150 acres ( 61 hectares ) of land at Aghia Paraskevi , a suburb ten kilometers from the center of Athens , on the northern side of Hymettus mountain .