Armed with cameras, they climb, often illegally, some of the world’s tallest structures. They’re in search of new sensations — or just new vantage points from which to admire the world. Their names are Vitaliy Raskalov, Vadim Makhorov, Daniel Lau, Tom Ryaboi, Alexander Remnev and Kirill Oreshkin, and they’re not afraid to appear in the stunning and vertigo-inducing images they snap hundreds of feet above ground, as part of a trend known as rooftopping. “We were curious to get to where you can’t shoot,” says the Russian duo Raskalov and Makhorov, known as On the Roofs.