I'm calling a tie between Wonder Wanda, who specified the Old Mill at Busch Gardens and some sort of movie-making, and Barbara Field, who was spot-on with the name of the movie.
In the 1915 photo above, Charlie Murray, Vivan Edwards and cast stand in front of the Old Mill at Pasadena's Busch Gardens in the Arroyo Seco for a scene in the film "Hogan's Aristocratic Dream."
The Old Mill still stands, although it is now on private property.
Mack Sennett brought cast and crew to the location for production of the film short.
Here's an excerpt from the book "Mack Sennett's Fun Factory" by Brent Walker:
Tramp Hogan, with his bum "valet" Dunn, dreams he is living the life of royalty in an 18th century setting but is awakened by farmer Haye's pitchfork.
In addition to the Old Mill, the film's locations included the Grecian pergola. . .
. . .arroyo fountain. . .
. . .and rustic bridge.
I haven't found a clip online of Hogan's Aristocratic Dream. I hope it's not lost to the ages!
Many thanks to Pasadena Museum of History and Pasadena Public Library.