Open City Museum: Unveiling the Cultural Heritage of Athens Through an -Augmented Reality Based- Time Leap. - Georgios Kallergis; Marios Christoulakis; Aimilios Diakakis; Marios Ioannidis; Iasonas Paterakis; Nefeli Manoudaki; Marianthi Liapi; Konstantinos-Alketas Oungrinis (HCI (35), 2020)