Architectural historian and critic Ian Volner takes a deep dive into the story of Trump's wall. He follows the conception, selling, design, and construction (or lack thereof) of this expensive and consequential barrier, giving listeners a detailed description of what's happening in Washington, DC--and along the border. He also travels far afield, to China, the Middle East, northern England, and back to our border to examine the barriers we've been building for centuries. Why do we build walls? What do they reveal about human history? 2019.