"The Man Who Walked Between The Towers" (Mordicai Gerstein)
Mordicai Gerstein has written and illustrated some beautiful books (including "Beauty and the Beast", which has also been adapted to a movie of sorts, which we have along with the book). He waited what he felt was a decent interval after the events of 9/11/01, but wanted to commemerate the Towers themselves - not for what happened on 9/11, but for something positive. He picked the events of August, 1974, when Philippe Petit crossed a cable between the two towers.

It's a great story, but since Gerstein is a realist, he mentions that the towers are gone. I know that the pages are coming, and that it's going to once again hit me like a ton of bricks, but every single time, it just stops me cold. There's only one page after that, but it's hard to read when you're all choked up like that. Even so, I recommend this book to anyone - it's a great story, and it's nice to think of the towers in another way.