A Preview of the 9/11 Museum

The National September 11 Memorial Museum officially opens on May 21, but the President and first lady will tour the space on Thursday.

CNN's Kate Bolduan got a preview of the building that is built almost entirely underground, some 70 feet down, in the literal footprint of the World Trade Center.

"There isn’t a museum like it, or an experience like it, where there is such a collective connection to it," Bouldan said.

"It does feel so real because everyone did live through it in some way.”

Joe Daniels, the president of the National September 11 Memorial Museum, gives CNN's Kate Bolduan a tour of the space.

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