You’ve probably already been on a pilgrimage once or twice in your life—perhaps when you visited the town where you grew up and you walked its streets with a full heart, seeing everything through the lens of memory. Or when you took a trip with a friend facing something big and scary, like a serious cancer diagnosis, and along with the fun was the knowledge of a powerful undertow just beneath the surface, making every stop for ice cream and view of a sunset bittersweet.