This great video shows where many scenes from Back to the Future where filmed and what they look like today.
The Hill Valley town square scenes were shot at Courthouse Square, located in the Universal Studios back lot . The exteriors for Doc Brown’s house were shot at the Gamble House. The exterior shots of the Twin Pines Mall, and later the Lone Pine Mall (from 1985) were shot at the Puente Hills Mall in City of Industry, California. The exterior shots and some interior scenes at Hill Valley High School were filmed at Whittier High School in Whittier, California, while the band tryouts and the “Enchantment Under The Sea” dance were filmed in the gymnasium at Hollywood United Methodist Church. The scenes outside of the Baines’ house in the 50s were shot at Bushnell Avenue, South Pasadena, California.