The High Museum, though under a huge expansion is certainly not a great collection, though it is pretty good. If you've traveled to any major cities you may be disappointed. However if you are a local they do have some very good traveling exhibits throughout the year. They also have good childrens programs and Jazz evenings and private showings. Worth a membership if you live close and worth a visit at least once if you visit Atlanta often. Can't wait for the expansion to open though.
more