Every US county I've been in, filled in the order I first passed through. The rings are the 50 state highpoints, filled in as I climbed them.

Data

Google location history, Moves app exports, Swarm check-ins, and hand-kept tags that started on Mob-rule.

Boundaries: US Atlas, from the US Census Bureau · Natural Earth · write-ups: Wikipedia (CC BY-SA 4.0) · Wikidata · photos: Wikimedia Commons