Stepped Roof (Here's a pic...)
Take a look at: http://www.knoxart.org/images/building_credit.jpg
You might notice the "steps" up the right side of the building. I don't see a door at the top and since this is an art museum it might just be artistic license in the building design (would that make it architectural licenses?).
Not that the architecture of the building or hypothetical ashtrays really matter. What is so inconceivable about a helicopter drop onto a building within easy view of an interstate?
I'm sure you doubters are all a bunch of twats who believe that men have set foot on the moon and that cows aren't actually our superluminal overloards. You're all a bunch of crazy bastards. Especially you Brit'tards from across the pond -ya'll talk funny.
Bill - Because he is the second coming and will lead all of us true M$ believers up to Nirvana during the rapture. (Although I'm still confused how heaven can be a spiritual state and a rock band at the same time. Although it may be that Kurt had to go there ahead of us to prepare things for our Lord Bill.