Imagine a Walkable City: Physical activity and urban imageability across 19 major cities Marios Constantinides, Sagar Joglekar, Sanja Šćepanović and Daniele Quercia EPJ Data Sci., 10 1 (2021) 56 Published online: 07 December 2021 DOI: 10.1140/epjds/s13688-021-00313-7