The Gateway Arch in St. Louis is the highest man made monument built in the United States.
The primary use of steel in bridges accentuates the development of technology.
The cracks on the Eads Bridge traces the history of the bridge back in 1874.
The Eads Bridge crosses the Mississippi River between Missouri and Illinois, and recall the historical Westward Expansion.
The pedestrians stop to gaze at and remind them of the beginning of St. Louis.