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.”
WATCH FULL PIECE ABOVE