Books in my signature series use photos of bridges, in homage to my wife's profession. This bridge is The Iron Bridge, the first bridge in the world to be made of iron, back in 1781. It's a symbol of the industrial revolution, which began near where I grew up in the Black Country. The photo is my own, which I took earlier this year. The design of the bridge looks somewhat unusual, nobody had built an iron bridge before, so they built it like they would build a wooden bridge. It took Thomas Telford to really use iron effectively in bridges.