There is a DEA anti terrorism exhibit at the Science Place at Fair Park here in Dallas. The first thing you see when you walk in, is wreckage from the WTC...twisted metal, shoes, a stuffed animal...... on the other side of that are pieces of the Pentagon. You probably weren't supposed to touch anything, but I was compelled to touch the metal from the WTC. Brought tears to my eyes and I couldn't say anything for quite a while