Tristian Jones gets paid to oversee Caernarfon Castle, part of Edward's Iron Ring. Here's how it feels to be King of the Castle.

Host Dan Snow reveals his thoughts on Conwy Castle's fortified toilet chute.

Towers sourced from The Medieval Fortress by Kaufmann and Kaufmann

Islamic architectural expert Benjamin Michaudel reveals the fascinating story behind Crac des Chevaliers' machicolations.