We recently had the opportunity to explore some of the off-limits spaces in St Paul's Cathedral. We started on the spiral staircase memorably featured at Hogwarts in the Harry Potter films. From there, we visited the clock room, London's most scary spy hole, and a little-known gallery at the very top of the inner dome. We also got to clamber over the roof and admire the statues that few rarely see. Film by Geoff Marshall. Photos from the visit are here.