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The Texas State Cemetery has one:

https://en.wikipedia.org/wiki/Texas_State_Cemetery#/media/File:Texas_State_Cemetery_September_11_Memorial.jpg

The National Atomic Testing Museum has one as well:

http://www.yelp.com/biz_photos/national-atomic-testing-museum-las-vegas?select=niex2U6LrzZXh0VocG0USA

Obviously the National September 11 Memorial & Museum has some, but, none-the-less, it makes me wonder... who else has them?

closed as too broad by Michael Hampton, JonathanReez, blackbird, CGCampbell, Willeke May 2 '16 at 16:36

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Pieces of the WTC have made it all over the world. I think such a list is going to be monstrous, and a bit too broad for our format. A good starting point might be here though. And the largest single piece is probably here. – Michael Hampton May 2 '16 at 6:02