The Black Lighthouse is a cursed building that was at the focal point of the chapter of the same name, though it also had a brief cameo in chapter 1.
The lighthouse was abandoned a long time ago, however began spewing a very hot light in Chapter 9 which caused people who looked into it to begin walking around in circles. Some of these people seemed aware of the fact that they were walking in circles, however, others seemed to think they were merely going somewhere and it was taking longer than they remembered. From inside the lighthouse, the light is hot enough to incinerate anything inside it.