The document summarizes Alex Green's visit to the National September 11 Memorial & Museum. It includes photos of the slurry wall that held back water during the building collapses, the last steel beam removed from debris that workers wrote memorial messages on, and the giant steel box beams that vertically supported one of the towers. The ground floor of the museum displays remnants of the towers, including box beams outlining where they stood and a vertical beam visible at the base. Fountains now stand where the towers once were at street level.

1. VISIT TO NATIONAL
SEPTEMBER 11 MEMORIAL &
MUSEUM
Slide Set 3 of 3
Alex Green
Penn State Class of 2015

2. Slurry wall.An amazing feat of engineering.
Next slide…

4. Next slide…
Another view of slurry wall.
This wall held back the river water despite the
forces of the building collapses.

6. Next slide…
The last major steel beam to be removed from
the debris….many of those working on the
site wrote memorializing things on this beam

8. Next slide…
Shows the enormous forces that bent and
sheared this massive beam when the
buildings collapsed

10. Next slide
Another photo of the last beam to be removed.
It now stands on the ground floor of the
museum

12. Next
On the ground floor of the museum, you can
see what remains of the giant steel box
beams which vertically supported one of the
buildings.They were cut as part of the
cleanup process since they go down to the
bedrock.

14. Next picture
You see the box beams that go around a corner
outlining where one of the towers stood.You
can also see the slurry wall in the background.

16. Next slide…
 A portion of one of the vertical beams that
were visible at the base of the towers when
standing.

18. Next slide
 At street level, there are fountains now where
the towers once stood.

20. Last slide
 Another picture of one of the fountains. Part
of the museum is directly below one of the
fountains. When you cross over the box beam
cutouts you actually enter underneath the
space where one of the buildings once stood.

22. End of Slide Set 3 of 3.