In September 2019 I embarked on a quest to sequentially visit every Prague Municipal Authority (Urad Mestske Casti, UMC) building from 1 to 22 as a way to visit every Prague district at least once. I would always start at a UMC and walk to the next one and take a selfie. I took year long breaks between the walks but never forgot the mission.
The lengths varied from 3km to 36km and I learned the UMC are built in a spiral which means the later ones are across the entire city.