...Darkroot Garden during the Age of Fire?
Because the entry to them looks EXACTLY like the path to Sif, just backwards. Hell, if you hug the right wall, you can find a run down building that looks like the connection to Alvina's clubhouse (and where the Stone Armour would be). In fact, you can see the building out the window.
Plus, the scarecrows look exactly like what I assumed were "plant people". And the golems.