The Forgotten Temple is the largest interior structure in Breath of the Wild — a colossal ruin in the Eldin region, filled with Guardian Skywatchers and overgrown with ancient moss, built around a central corridor stretching farther than any other enclosed space in the game. Its primary function is housing a shrine at its far end. Its secondary function is containing a Goddess Statue whose dialogue extends the game’s creation mythology beyond what any other statue in the game covers.
Reaching the Goddess Statue requires crossing the temple’s full length while Guardians scan from above — a sequence that cannot be fought, only avoided, and which takes longer than any single combat encounter in the game. The Statue itself is not required for completion; it offers Stamina and Heart upgrades that are available from any Goddess Statue.
The Temple’s environment is the densest application of Breath of the Wild’s ‘world as message’ philosophy: the moss growth pattern indicates how long the Guardians have been dormant. The cracks in the floor from corrupted Guardian movement show the battle lines of an engagement that ended before the game began. The specific Guardian positioning suggests they were placed to converge on something at the Temple’s far end — the Statue.

Saved this article for my gaming reference folder. Essential reading for anyone serious about this game.
This is exactly why I love this game. So many layers underneath the surface if you just take the time to look.