The last part of the Cathedral, the tower, was finished in 1518. Of the two planned towers, only the northern was finished. The octagonal portion of the tower, constructed between 1501 and 1507 was designed by Herman de Waghemakere. Inside the tower is a carillon with 47 bells. The actual spire was built by Domien de Waghemakere, Antoon Keldermans II, and Rombout Keldermans between 1508 and 1518.