Old Spanish Trail mile-stone zero

The Old Spanish Trail (the OST) was an auto trail that once spanned the United States with a full 3,000 miles (4,800 km) of roadway from ocean to ocean. It crossed eight states and 67 counties along the southern border of the United States. Work on the auto highway began in 1915 at a meeting held at the Battle House Hotel in Mobile, Alabama, and, by the 1920s, the trail linked St. Augustine, Florida, to San Diego, California, with its center and headquarters in San Antonio, Texas. The cities in between boasted a shared heritage of Spanish missions, forts and Spanish colonization.