Answer: cornerstones

AnswerCrossword Clue
CORNERSTONESBuilding blocks
cornerstonesAn important quality or feature on which a particular thing depends or is based
cornerstonesA stone ceremonially laid usually at the corner of a foundation to mark the occasion of a building being erected
cornerstonesCORNERSTONE, a stone forming a part of a corner or angle in a wall
cornerstonesA stone that forms the base of a corner of a building, joining two walls