A somber Paul Simon performed an emotionally wrenching version of “Sound of Silence” at Ground Zero during Sunday’s ceremony marking the 10th anniversary of the Sept. 11 attack on the World Trade Center.

One World Trade Center (1 World Trade Center), more simply known as 1 WTC and formerly known as the Freedom Tower, is the lead building of the new World Trade Center complex in Lower Manhattan in New York City.

The 9-11 attacks on the World Trade Center in New York and the Pentagon are now a sad history. This year the USA will commemorate the 10th anniversary of the September 11, 2001 events. Let’s compare the photos taken back then and today.