Just before sunset near Page, Arizona, a parade of humanity marched up the sandy, half-mile trail toward Horseshoe Bend. They had come from all over the world. Some carried boxes of McDonald’s Chicken McNuggets, others cradled chihuahuas and a few men hid engagement rings in their pockets. But just about everyone had one thing at the ready: a cellphone to snap a picture. Horseshoe Bend is one of the American west’s most celebrated overlooks.