Review: Walls: A History of Civilization in Blood and Brick

I review the book Walls: A History of Civilization in Blood and Brick, with a particular focus on the way the history of walls has been misinterpreted and distorted by recent examples of wall building. This is a problem, because it's actually more important than ever to understand the correct history of walls as we enter a second age of wall-building. Though most modern walls are built to keep out immigrants not invading armies.