Three years ago we went as a family to the 9/11 memorial which at the time was still surrounded by a fence. The museum had not yet opened. This year in June, when my mother was visiting from Germany, I went with her to the museum. I did not realize before entering that the museum extends underground around the reflecting pools and exposes the foundations of the Twin Towers as well as the bathtub wall. The museum provides a striking contrast between its cavernous underground space and the inte...