Counties visited map
All 3,141 US counties, on a scale rather than a checkbox. Passed through, visited, stayed a while, and lived there are different things, and a county map that cannot tell them apart is not tracking much.
Why a scale beats a checkbox
Airport layovers and interstate crossings are not the same as a week somewhere. Five steps make a county map worth arguing about, which is the only reason anyone looks at someone else's.
Nothing to install, nothing to buy
Your map lives in the link. Send it, and whoever opens it starts their own copy and sees yours beside it when they finish.
Other maps at this granularity
US states, major US cities, and every other map use the same scales and the same export.