The 16th of April in 2025 was a warm and bright spring day, and a lovely environment for the KFG’s 14th City Walk: “Building Nature.” This program, organized by doctoral students Aileen Becker and Constanze Schaller together with spokesperson of the “Urbanity & Religion” research group Jörg Rüpke, introduced the newly-arrived cohort of fellows, as well as regular members, to some of the finer, greener points in Erfurt’s history.