 Many churches never completed construction of all the planned towers.Initial plans for the rebuilding of the cathedral at Rheims called for seven spires, none of which were built, and while the two west towers were eventually finished, the two west front spires have never been built.Similarly, Westminster Abbey's crossing tower has for centuries remained unbuilt, and numerous architects have proposed various ways of completing it since the 1250s, when work began on the tower under Henry III.