Two noteworthy specials will air on WETA PBS-23 tonight related to the 9/11 attack on New York City. First will be what DCist has heard is a very good NOVA documentary about the World Trade Center attack titled “Why the Towers Fell” at 8 p.m. Second, at 9 p.m., is the premier of a new Frontline documentary titled “Sacred Ground” about the planning surrounding the site’s reconstruction. Featured in the Frontline documentary is wrangling surrounding designer Daniel Libeskind’s plans for the site. Our sister site Gothamist has also posted something about the documentary tonight, and the debate surrounding the “Freedom Tower.”

Here in D.C. the AP noted in a recent story that slight discolorations on the Pentagon from the 9/11 attack there are still visible, and

A permanent 2-acre memorial is planned, however. It would be built about 165 feet from the now-repaired face of the Pentagon’s west facade. Proponents of the project have said in the past that they would like to be able to dedicate it on Sept. 11, 2006, but it still faces a long approval process.

The story notes places to go in D.C. to commemorate the attacks include a Pentagon-shaped memorial marker at Arlington National Cemetery, lists of victims’ names at the National Law Enforcement Memorial and the National Fallen Firefighters Memorial (foundation website) at the National Fire Academy in Emmitsburg MD, and a “small exhibit” of 9/11 artifacts at the Air and Space Museum’s annex near Dulles airport (where you can also see the Enola Gay).