Welcome to Historic Annville! The Adventure Lab only has 5 locations, but there are so many historical places in Annville. You can walk from the parking to the locations and if you want, drive to the mill. I hope to create a WhereIgo with all of them in the near future if I ever figure out how. I had a very hard time picking only 5 locations. Anyway, the bonus is only available till dusk.
Here are the coordinates to fill in:
N 40 19. A B C W076 30. D E 5