Fire place? (3)
(Other definitions for grate that I've seen before include "Grind, rasp" , "Irritate - rasp - fireplace" , "Shred; scrape" , "Grind (cheese)" , "Make a harsh rasping sound" .)
(Other definitions for pit that I've seen before include "A hole as for coal" , "Quarry" , "Large deep hole in the ground" , "Coal mine" , "Cherry stone" .)