The "Ten Mile House" which had been located at Gravois and Tesson Ferry was a well-known landmark. The name itself had much significance. In the days of the horse and carriage, there were not many road markers as we know them today. Instead, travelers were guided by different buildings along the way. They devised the scale that any building one mile (1.6 km) from the Court House in St. Louis (now the Gateway Arch National Park) would be called the "One Mile House", meaning one mile (1.6 km) from the Court House.