Chicago's street grid is famously logical, built around a numbering system that makes it possible to estimate distances between addresses with real precision, a rare gift for a walker trying to plan a route on the fly. The Loop, downtown's core, is compact and dense with architecture worth pausing for at every corner.
Lake Michigan gives the city a long, mostly flat lakefront trail that stretches for miles, popular with walkers, runners and cyclists alike, and it offers a genuinely different pace from the busier streets a few blocks inland.
Winter is the real obstacle to walking here, with the city's exposure to wind off the lake making even short outdoor stretches feel much colder than the temperature alone suggests. Summer, by contrast, is one of the most pleasant times to be on foot in an American city.