Many people think that guerrilla marketing is a very recent phenomenon, but some non traditional marketing concepts date way back. Rock City in Tennessee started a very unique marketing campaign in the mid 30s using existing barns along popular roads in the Southeast and the Midwest and painted their "ads" on them. As big as would fit on the side or the roof of the barn, it said "See Rock City" or "See 7 states from Rock City." At one point there were almost 900 barns with the Rock City logo but the rules in terms of signs changed with the Interstates. Today the still existing 70 Rock City barns are popular tourist attractions.