Little cave on one end of the Bridge of Eldin

[Aureliano]

There is this cave looking thing on one end of the Bridge of Eldin.  You can't get in because there is a big gap there, and if you talk to Midna, she says something about not being able to reach it unless there was a ledge.  How do you get there?

[Fishalicious]

Eh? There's a clawshot target on one of the upper ledges, you go up there, through that cave, and there's a few chests, one has a heart piece. You come out fairly low, and you clawshot from one point to another until you come out above the bridge.

Yeah, I hope that's what you're talking about.

[Aureliano]

I think you are talking about a different cave near the Bridge of Eldin.  The one I am talking about is on one end, before you even get off the bridge

[MagmarFire]

Is it in the actual bridge itself, then? If so, then you'll need the Dominion Rod to control an Owl Statue to the gap to serve as the platform. ;)

[IronKnuckle]

You need the dominion rod.

Bring the owl statue on the north end and position it between the two ledges and you can jump over to it. Climb up the ladder and you get a heart piece, and one of the best sniper spots in the game.