| Jefferson National Expansion Memorial, St. Louis, Missouri (Sept, 2009) |
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The arch is a very impressive engineering
feat! You can walk right up to the base and touch one of the
¼-inch think stainless steel plates that form the exterior skin.
The arch is 630 feet high by 630 feet wide at the base. You
can check out all the cool data about the structure on the
NPS site.
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