I'm lucky to live next to Prospect Park, which is a beautiful place to run. I've done the main loop of the park hundreds of times over the years.
Toward the end of 2014, I decided to take a break from running the same route around the park and instead explore the neighborhoods bordering the park. Compulsively, I decided to systematically run on every street in a region around the park.
(This doesn't work great on mobile.)