well land 1 has 4: 1 is for the creature breeder, another is for the hermit, but i dont quite know what the others are for. Theres one near the hermit on the hill, and theres another on the shore near the mushrooms (possibly for that weird mushroom challenge.) On land 2, there are 2 near the shore for the guys to live in that whistle songs and walk around. dont know if it is Celtic, but theres a stray house on land 3 for the witch to live in. Land 4, im not sure if there are any Celtic houses, but there are alot of norse ones =P Also, land 5 has no stray ones that im aware of, but i havent really noticed one.