May 25, 1968 The Gateway Arch is Dedicated in St. Louis, MO

The Gateway Arch[5] is an arch that is the centerpiece of the Jefferson National Expansion Memorial in St. Louis, Missouri. It was built as a monument to the westward expansion of the United States. At 630 feet (192 m), it is the tallest man-made monument in the United States,[4] Missouri's tallest accessible building, and the largest architectural structure designed as a weighted or flattened catenary arch.[4]

The arch is located at the site of St. Louis' foundation,[6] on the west bank of the Mississippi River where Pierre Laclède, just after noon on February 14, 1764, told his aide, Auguste Chouteau, to build a city.[7][8]

The Gateway Arch was designed by Finnish-American architect Eero Saarinen and German-American structural engineer Hannskarl Bandel in 1947. Construction began on February 12, 1963, and ended on October 28, 1965,[9][10] costing US$13 million at the time[11] (approximately $94,700,000 in 2013[2]). The monument opened to the public on June 10, 1967.[12]

http://en.wikipedia.org/wiki/Gateway_Arch