After having visited New York's four very large and unique Apple Stores, coming back and visiting the St. Louis Galleria Apple Store was somewhat of a letdown. The store has been reported to be the world's smallest mall Apple Store, and it was quite apparent upon entering.
The Galleria Store was known for being incredibly cramped, and one would often see many Apple employees training Mac users in the common areas around the Mall. One was lucky to be able to grab an Apple employee to simply make a quick purchase within 5 minutes of entering the store!
Now, the Apple Store inside the St. Louis Galleria is likely one of the largest, if not THE largest, Apple Stores in a mall, in the world.