St. Louis: William Suellentrop, 5, of St. Charles, Mo., looks out over the Mississppi River from the observation deck of the Gateway Arch in St.
Louis. The arch, 630 feet high, was built between 1961 and 1966 to commemorate the many people who passed through St. Louis during the western expansion of America in the 19th century. St. Louis marks the split between the upper and lower Mississippi River. Mike Dean / Mike Dean/CNHI News Service
