Although it was the largest church in Christendom until the completion of Rome's St. Peter's Basilica in the early 17th century, little remains of the original buildings. In total the surviving parts amount to about 10% of the original floor space of Cluny III. These include the southern transept and its bell-tower, and the lower parts of the two west front towers. In 1928, the site was excavated by the American archaeologist Kenneth J. Conant with the backing of the Medieval Academy of America. Ruined bases of columns convey the size of the former church and monastery.