The 9/11 Memorial in Lower Manhattan opened to the public Monday for the first time since the site was attacked in 2001. Visitors were allowed to walk among hundreds of white oak trees on the eight-acre site and gaze at the water on the exact spots where the World Trade Center's twin towers stood. They will also be able to run their fingers over the names of the 2,977 people killed in the terrorist attacks in New York, at the Pentagon and in Pennsylvania, as well as the six who died in the bombing of the trade center in 1993. Electronic directories with a "Find a Name" button will help people locate their loved ones. The memorial plaza opened to the families of the victims for the first time on Sunday, the 10th anniversary of the attacks.