I found this one day by accident and then kept coming back to it as a photo / movie location. There’s miles and miles of nature and old stonework and a river underneath the Suicide Bridge in Pasadena, California.
If you wanna check it out, park at the San Pascual Stables and make for the trailhead at the north end of the lot. This is the Arroyo Seco Trail (“dry stream” in Spanish), which follows portions of the 25-mile seasonal river via a bike, hike, and equestrian track. (Check the map before you begin, to get a better idea of the entire city-to-mountain route along the waterway.)
Thanks for reading,