In the early 1930s, when the writer Paul Bowles first visited Tangier, Morocco, where he would end up living for more than a half-century, he described its medina, or old city, as “ancient, its passageways were full of people in bright outlandish costumes, and each street leading to the outskirts was bordered by walls of cane, prickly pear and high-growing geranium.” Today Morocco’s medinas are much the same.