London

Other tourists may remember London for its spectacular sights and history, but I remember it for Islam. When I was visiting the U.K. as a teenager in 2006, I got lost in an East London market. There I saw a group of women wearing head-to-toe black cloaks. I froze, confused and intimidated by the faceless figures. It was my first encounter with the niqab, which covers everything but a woman’s eyes.

This...