This is incredible. Strava is a data aggregation company that (among many other things) tracks location data from fitness and other devices such as FitBit or even fitness apps on your phone. On their website they have a 'global heatmap' where you can look at any area on the planet and see a representation of activity.
For example, here is where people walk/run/jog at Gitmo:
https://labs.strava.com/heatmap/#15.21/-75.14716/19.91738/hot/run
Check out the popular trails at Yosemite Nat'l Park:
https://labs.strava.com/heatmap/#11.21/-119.50297/37.82344/hot/run
Locate mysterious activity in Antarctica:
https://labs.strava.com/heatmap/#5.21/18.72631/-72.48034/hot/all
