The National September 11 Memorial & Museum opens with a ceremony Thursday in New York City, in the footprint of where the Twin Towers once stood. "It was very, very profound, very emotional — much more than I thought,'' former New York City Mayor Rudy Giuliani told Matt Lauer on TODAY Thursday of seeing it for the first time.
"In some ways, it's harder now to relive it than it was a year later, two years later, three years later, maybe because you don't think about (the memories) as often and when they come back, they're more powerful."
By the numbers, the sheer scale of the museum is breathtaking.
- 110,000: Square feet of exhibition space in the museum, located in the heart of the World Trade Center site.
- $700 million: Cost of construction of the museum.
- 23,000: Photos and images collected connected to Sept. 11 that line the walls of the museum.
- 10,300: Artifacts are on display, 2,380 of which were provided by donors to the museum.
- 500: Hours of video images can be seen.
- 1,970: Oral histories of Sept. 11 experiences collected and preserved.
- 8,151: Tons of structural steel used to construct the memorial and museum.
- 49,900: Cubic yards of concrete used in the construction.
- $60 million: Operating budget for the museum.
- 24: Hours a day the museum will be open for the next five days for families of victims, first responders and survivors.
- 7: Stories below the North and South tower memorial pools where the museum is located.
- 20,000: Number of tickets that have already been sold for the coming months, reports NBC's Kate Snow.
The museum opens to the public on May 21.