this is a romare bearden from the 1950s. >> pelley: sleepless nights are all in a day's work for thetor, lonnie bunch, a scholar of the 19th century. >> bunch: clearly, this is... ought to be one of those moments where people are going to sort of reflect, pause. what does it mean once we open? what does it mean in terms of development opportunities? >> pelley: in 2003, president bush signed the law creating the museum. congress put up $250 million, and bunch has raised most of another $250 million. >> bunch: i knew that this is where this museum would have to be, that this is america's front lawn, and this is the place where people come to learn what it means to be an american, and this museum needs to be there. >> pelley: so, we're on the ground floor. this is where the visitors will come in. this will be their first experience in the museum. so, what's going to be here? >> bunch: they will walk in either from the mall or from constitution ave, and they will run into amazing pieces of african-american art. >> pelley: when all of this is finally complete, what will america have? >> b