A small area in Yankee Stadium behind the left-field wall. If you arrive at the game early, you can go inside and look at lots of plaques honoring former players of the New York Yankees. Every player with a retired number has a small mini-exhibit in there, plus some more notable players have very large plaques. They include Babe Ruth (as worshiped by David Wells), Joe DiMaggio, and Yogi Berra. There is a screen above the park, so fly balls will not drop inside.
Thanks to Billy for correcting me about David Wells.