Yeah, it's the Nelson-Atkins and is free to go in, unless there's a special exhibit or something going on. But, even if you don't see the special exhibits, the free portion will blow you away. Start in the North west corner of the large building and then go counter clockwise - NW, SW, SE, NE, etc. to go from the oldest to the latest in time. You'll spend all day there, by the way.

CharlesH