4 WTC

For those doing the full run, it meant climbing 72 floors of stairs.

Construction on the 72 floor, 978-foot-tall building commenced in August of 2009, and finished up earlier this month.

If you've ever wondered how "they" get escalators up to the tops of skyscrapers, well, you've got a very wide-ranging curiosity, don't you?

The wind apparently caused a beam being lifted to crash into the side of 4 WTC.

Apparently the worker fell and impaled himself on some rebar.