Yeah,we had a flagpole surrounded by a chain-link fence in straigtaway center. Any ball that rolled inside the fence was a ground rule double.
I can readily recall a half-dozen things like that, and if I think, probably many more small "special rules" on Little League and High School ball fields.
"No other sport....." is a precarious statement; there are a lot of other sports out there, some of which are bound to have their own oddities.