The Legend of Zelda: Breath of the Wild for the Nintendo Switch and Wii U doesn't officially support mods. Modders have taken it upon themselves to rectify Nintendo's oversight. In a scant couple of years, the community has gone from making simple texture-swaps and generally goofing around to building new Shrines from the ground-up. Take a look at "The Ancient Cave."
This new Shrine, which is the work of modder "HailToDodongo," replaces the Ja Baji Shrine (i.e. the Shrine where you find the Bomb rune) on the Great Plateau. While the Ja Baji Shrine serves as a short tutorial level that lets you learn the basics of moving around and puzzle-solving in the vast world of Breath of the Wild, HailToDodongo's Shrine assumes you're already learned in the ways of adventuring. The slippery walls spill directly into pits of magma, enemies are everywhere, and you have to contend with deadly Guardians in areas with low lighting.
You'll even find a Silver Lynel or two. Silver Lynels are amongst the strongest and shrewdest foes in Breath of the Wild. They're tough to fight in the open fields of Hyrule, and they're even deadlier in a small, enclosed space like a Shrine.
Also worth noting is how The Ancient Cave mod uses some unique textures for the level. Breath of the Wild is a wonderful game, but there's no denying its dungeons and Shrines all blend together because they all share the same texture pack. It's amazing how some brick columns and a few square yards of black-and-red tiles can really jazz a place up.
You can download The Ancient Cave mod at Gamebanana. If you're looking for a more Nintendo-approved experience, learn how The Legend of Zelda: Breath of the Wild interfaces with Labo VR.