Many of London’s medieval churches are nothing but ghosts now—the tiny green space of their former churchyard all that remains, left undisturbed out of respect for the souls interred under the stones and trees. Tucked down alleyways and easy to miss in the shadows of nearby office buildings, each one still tells its tale of the church that once stood there, the people who worshipped there, the births, deaths, and marriages that were celebrated within its vanished walls. Sometimes even churches were given gravestones, as if to acknowledge all that they once witnessed.