High Quality Content by WIKIPEDIA articles! Wallenberg, also known as the Wallenberg Four, is located at the Wallenberg Traditional High School in San Francisco, California.It is a popular gap among the skateboarding community and measures 6 feet high and 22 feet and 6 inches long.The Wallenberg gap first appeared in Mark Gonzales's part in "Video Days," a 1991 skateboarding video released by Blind Skateboards. More recently, Thrasher skateboard magazine hosted "High Noon at the Big Four" at the famous spot. Unlike traditional skateboarding competitions, there were no rankings or standings; the 2004 event was billed as a "big tricks contest."