Box Canyon - Credit: Wikimedia Commons
Box Canyon in Anza-Borrego Desert State Park in San Diego County, is a California Historical Landmark No. 472 listed on September 11, 1950. Box Canyon is a desert canyon and mountain pass on the Historic Southern Emigrant Trail. The US troops under General Stephen Watts Kearny and with US scout Kit Carson found Box Canyon and its pass in October 1846. On January 19, 1847, Kearny was the leader of a wagon train with Colonel Philip St. George Cooke and the Mormon Battalion that used Box Canyon to head west. The group used hand tool to widen and clear Box Canyon so the covered wagons could pass. The road through Box Canyon became the first road into Southern Alta California. Read more on Wikipedia
Source: en.wikipedia.org