With relevant experiences gained in Caracas, Urban Think Tank (U-TT) now addresses the European city. One of the most recent proj-ects of this multidisciplinary team, focused on Athens, suggested ways of reactivating the city centre. Alfredo Brillembourg, Hubert Klumpner and Alexis Kalagas of U-TT explain their approach, which has been documented in a book recently published by Ruby Press.