The Bronson (Bat) Cave is located in Bronson Canyon in Griffith Park. The cave is a manmade tunnel that is pretty accessible from the main road, which makes it a short easy walk and a nice filming location. The tunnel was featured as the Batcave in the campy 1960’s Batman television and movie series. The list of movies filmed at the location is pretty long. Some notable ones include The Three Musketeers (1933), Invasion of the Body Snatchers (1956), Batman (1966), and Star Trek VI: The Undiscovered Country (1991). A number of television series have also included the tunnel in some capacity, including Batman, Gunsmoke, The Long Ranger, Rawhide, Bonanza, Little House on the Prairie, Star Trek, Twin Peaks, and The Adventures of Brisco County Jr.
Park at the end of Canyon Dr. (around 2800 Canyon Dr.) at the “Camp Hollywood Land” parking area. The road to the caves is just before the “Camp Hollywood Land” sign on the right (if you are facing the end of the road). The car at the beginning of the youtube video clip below takes the road to the cave, you can also see it in the image on the right (the image on the right was taken looking away from the end of the road, so the trail to the cave is on the left). You will be able to find the cave easily by following the path, but you can find a more complete map here. Watch out for snakes resting inside the cave, and be sure to check out the view of the Hollywood sign on the other end of the tunnel. The hike is approximately a mile round trip, and will only take about 20 minutes or so, so plan getting an actual workout by hiking to the top of the Hollywood sign. You can find a map to the Cave and the Hollywood Sign here (topographic) or here (street view) or you can find a nice map on the Modern Hiker website.