On Saturday 21st October, the European Space Agency opened the doors of the European Space Astronomy Centre in Villanueva de la Cañada (near Madrid), ESAC, to host the ESA Open Day. With a full program of talks and activities, the event featured tours, hands-on laboratories for children and get-togethers with science communicators, ESA astronaut and experts. More than 1800 people, among adults and children, had the opportunity to deepen their knowledge of the activities and programs in which ESA is involved every day.