One is round, and the other is square. Weill’s structure (designated as Tower H), which is discussed in this article, was not identified as such in 1920 (R. Weill, La Cité de David (Planches) (Paris, 1920), pls. III, VII, VIIb) but was identified as a dovecote by Donald T. Ariel following the discovery of a similar and better-preserved structure in nearby Area D2. This tower was dated to the late Hellenistic period (prior to the first century B.C.E., according to Alon de Groot [personal communication]). My thanks to Donald T. Ariel and Alon de Groot for kindly supplying this information.