A lot of visitors don't realize that there is a lot going on at the World Trade Center besides the Freedom Tower and the 9/11 Memorial. But when it's done, the site will consist of four skyscrapers, the memorial, the 9/11 museum, a transit hub, and a performing arts center. Plus 7 World Trade Center already opened in 2006 across the street. But today, 4 WTC opened for business. It's a beautiful mirrored glass building and it has some cool looking waterfalls and art in the lobby I can't wait to check out. Here's a photo I took of the building back in May.