My best friend from high school Kinnari Shah and I have made it our thing to travel together every few years, and this trip we settled on Istanbul, in part because neither of us had ever been, and in part because our AP Art History teacher, Madame Gehrels, taught us about the beautiful architecture there, especially the Hagia Sofia. I still remember the sense of wonder she instilled in us as students about the structure and its design, its history, its influence. The lesson was strong enough to stay with us for nearly four decades, leading us finally to commit to seeing it for ourselves.