Inside A Xinjiang Detention Camp

It started as a single small compound. Within 18 months, it had grown to more than 10 times its original size, capabl of holding about 3,700 detainees. China's mass internment system for Muslims in Xinjiang is so secretive that, despite a growing international outcry, little is known about any one detention camp. Interviews and architectural modeling offer a rare and terrifying view into a massive internment complex.