What is this?

[BigV]

Originally Posted by glatt

#88 is a glory hole into a bullpen

No more callers, please. We have winner!

At Safeco Field, home of the Seattle Mariners, there is a pub/bar in left field. It is right at field level. There's a low overhanging roof with a window out into left field, covered by a net. When you're sitting at the bar looking out this window onto left field, to your left is the visitor's bullpen. This picture, #88, is a little round window with glass (or lexan probably) about the size of a baseball. looking onto the bullpen from the catcher's perspective. There are several of these little windows.

Good call glatt!