What is the most unusual design characteristic of the Pentagon and why was it built that way?

Despite its size, it takes only seven minutes to walk between any two points of the building because of its unique design.

For that design, see:

http://www.dtic.mil/ref/html/Welcome/general.html

Racer, as always, you are in the ballpark. Unfortunately for you, so are the NY Mets. That is not what I was after. When you walk through the building, you see it right away.

OK XFED, either need a clue or I give up, don't know.

Ya could roller blade in the place - there's no steps! Ramps connect the floors. They thought it would be used as a hospital when the military didn't need it anymore.

Ohhhhhh, is that why they always say they have to "ramp up" for an event!

Kwll - One thing you have to admire about the military. Only they could use "ramp up" to describe an event in which you butt will get shot at!