The Temple Ruins is an area surrounded by large fields of sunflowers.
There are not too much to do in this area, there is a dead body in the center of the Temple Ruins and you can fight against The Executioner.
You can find some feathers, cloths, scrap and other materials in the zone.
You can find the Canteen in one part of the zone.
If you pass near crows, they will fly and will alert the Executioner.