Eh. The original Zelda is vaguely non linear. But there are several sequential dependencies for dungeons. Once you’re done with the first 3 it’s pretty darn linear for things like the ladder and the bow and what not. And that game has a progression curve that makes it fairly punishing to do things out of order for normal players. I would say that game forces you to be lost whereas botw really allows you to enjoy exploring. The original isn’t that big and you’ll probably find yourself scouring the same few areas annoyedly over and over.

Zelda 2 was pretty linear too.

The twin mountains are spectacle rock. They have appeared in many games. Most notably, imo, they’re in the crater of death mountain in ocarina of time. If you squint at the way the fire temple is built (two towers) it’s sort of implied to be built inside of it. Very cool

https://zelda.fandom.com/wiki/Spectacle_Rock