Jefferson National (Western) Expansion Memorial--"Gateway Arch"

This catenary arch, with a sheathing of stainless steel, commemorates the Lousiana Purchase and the western movement. It is on an axis with the St. Louis Courthouse. This curved form, like Saarinen's Ingalls' Hockey Rink at Yale and his TWA terminal, was Saarinen's last achievement.

Looking up
The arch is 630 feet high and 630 feet wide. Elevators ascend the arch on both legs with five people to a car. While it seems to celebrate earlier events in American history, one could say it celebrates technology as well.