Cairo, Egypt, in its history[?] has had a significant number of fortified gates protecting both inner and outer city. Apart from the purpose of defense they were also used for differentiation of the varied social and economic classes. Often the gates were heavily decorated as artistic pieces.
... in the 17th century, and still better from those of La Pérouse (1787) and Krusenstern (1805). Both, however, regarded it as a peninsula, and were unaware of the existence ...