Hundreds of thousands of people have signed up for free tickets to see the new memorial at ground zero.
About 7,000 people had tickets to visit the memorial as it opened to the public on Monday, and 400,000 have registered online to visit in the coming months, according to the nonprofit organization that oversees the memorial.
The monument has two 30-foot-deep pools, bronze plates with victims’ names and grove of 200 oak trees.
Many visitors made pencil-and-paper rubbings of the names to take back home. Others left flowers or written messages.