Gateway Arch National Park is an American national park located in St. Louis, Missouri, near the starting point of the Lewis and Clark Expedition.
The memorial was established to commemorate:
the Louisiana Purchase and subsequent westward movement of American explorers and pioneers;
the first civil government west of the Mississippi River; and
Wikipedia https://en.wikipedia.org/wiki/Gateway_Arch_National_Park
Address St Louis 63102, United States
Coordinates 38°37'29.093" N -90°11'7.877" E