The attractions and amenities of the city are just as rich as its history. The Gateway Arch, opened in 1965, was constructed as a monument to Thomas Jefferson for his vision of a continental United States. The arch makes up one part of the Jefferson National Expansion Memorial, while the Museum of Westward Expansion and the Old Courthouse -- one of the city's historic structures -- make up the remainder. The new Lewis and Clark State Historic Site and the Lewis and Clark Center further chronicle the treacherous exploration of the West. MORE