Tags: The Gateway Arch, The
St. Louis Arch, St. Louis, Missouri, monuments
|Did you know?... The Gateway Arch is in St.
Louis, Missouri. It is built in the form of a
catenary arch, and it is covered in steel. The Gateway Arch is the tallest man-made
monument in the United States. The Gateway Arch was built as a monument to the
westward expansion of the United States.