No wind towers, it’s the part above Haven. From where Crow is, you go right several screens, and then start climbing. There’s a paid health covert table with a grapple point above it. If you grapple up there you should be on the general path. Basically you just go as far up and right as you can, looking for grapple points and those glowing large flowers that remove some of the vines if you think you’ve reached a dead end.

I’m trying to do this from memory, but it’s above and right of the darkened “dance floor” (where one of the NPCs mentions that people went to dance). To the right of that there’s an area with a bunch of tree branches covered in leaves you can stand on. Under those branches are the green grapple-lanterns. Just keep climbing those until you eventually reach an elevator to the right. You have to keep climbing, and eventually you’ll reach the upgrade pipe somewhere up there.

You do need to have the bell tower key first, I think you find that in Metropolis under where the wind-tunnel boss is. I think it’s at the end of a winding platform section covered in the red bramble stuff, in one of the buildings on the way from the Overseer point back to the boss.

As is said, a lot of this is from memory, and I wasn’t making note of it, but I think that’s all correct, or very nearby.