[AFreeBird]

You're thinking torps only, or perhaps guns, but 5" shells would just bounce off a battleship's hull. I suppose a Harpoon could take out the bridge superstructure.

But when you consider the Navy also does attack, and close air support, well, a precision guided bomb through the deck into a powder magazine would do the job.

[Little Ray]

The armor around the magazines is foot of steel and more. Really.
Most of the the current weapons of the Navy could tear up the superstructure, but wouldn’t hurt the citadel or the armor belt.

Now there are some “bunker busting” guided bombs that might do some interesting things to a battleship, provided they could hit a moving target (GPS isn’t designed for a moving target...).