General view of the apse on the east end of the choir; St. Paul's, the largest cathedral in England, is Wren's masterpiece and one of the finest church designs of the English Baroque. "Work was thus begun not on the traditional Latin-cross plan approved in May 1675 but on one in which the western part is, both inside and outside, sharply differentiated from the three-bay nave proper, equal in length to the choir. Thus the building appears to have a stretched but centralized plan with a western annexe. The elevations too were changed: the basilican aisled structure is completely encased in a continuous two-storey screen wall which gives both statical bracing and massive visual support to a dome almost as wide as that of the Great Model, a fe...