Small abandoned racetracks, there is 2 separate tracks, one is definitely intended for RC cars, but there is another that could be used for dogs or bikes.
Someone who I shared the pictures with found these videos of the site in use
Don't delete it - just edit it and when doing the sizes, use the "Medium (800x564)" option - basically, the one that has a width of 800px (the vertical will vary from what I said).