Courthouse Square is located at Universal Studios and was used as a filming location for Back to the Future 1 and 2.
Many other movies and TV series have also been filmed in this iconic area.
Movies: Gremlins, To Kill a Mockingbird, Psycho II, Sneakers, Weird Science, The Nutty Professor, Escape from L.A., Batman & Robin, Amistad, Bruce Almighty
TV Series: Knight Rider, Magnum, P.I., Sliders, Falling Skies
The Offspring & Extra
While writing this blog post, I discovered that the music video for The Offspring "Why Don't You Get a Job?" was also partially filmed at Courthouse Square.
During the Universal Studios tour, you can still see the distinctive stone "entrance" pillars:
Back to the Future II - Tunnel Scene (Battle for the Book)
I don't quite recall, but I believe it was in the documentary The Movies That Made Us where they explained that the spacing between the lights inside the tunnel was intentionally varied to create the illusion of a longer tunnel.