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In response to "Drove through St Louis again to drop my daughter at summer camp for two weeks. The Arch is still a phenomenal sight." by TWuG

Thing I just learned last week: the arch is built of stainless steel.

I have never been there, but I always assumed it was standard reinforced concrete. I don't know how I missed the fact that it was stainless steel.

It is currently the largest stainless steel structure in the world.


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