Registration for tickets to the September 11th memorial at the World Trade Center site in Manhattan begins today, but the set-up is still in progress.

The site is set to feature "two-acre wide pools where the twin towers once stood" and a 30-foot waterfall.

The tree-lined memorial plaza is scheduled to be open for 9/11 family members on the 10th anniversary of the 2001 attacks and to the public starting the next day, September 12th.

"There's a lot of work to do. Tight deadline," Arad told me. "We just want to make sure everything's done very carefully, because we're not building for a deadline. We're building for the ages."

The names of nearly 3,000 people killed by the attacks will be etched in bronze around the pool perimeters.

Visitors can go here to sign up for specifically timed entry tickets.

9/11 Memorial tickets on sale online Monday [CBS News]