For a while, I've been curious about this former Rexall Drug not too far from me, at SE 67th and Foster, shown here via Google Maps Street View:
Even I can tell the building's in bad shape. That "U" sign on the front means "Unsafe," meaning "enter at your own risk," and trust me, I respect that. But I still wonder what's in a building like this.
How to do that safely? I hope people do so with drones. I can picture someone standing in the open doorway of an old building, and sending in a small drone with cameras and lights. Steel could, I understand, cause a problem with reception, but a heavily brick building like this might be more manageable. How wide are any stairwells? Wide enough for a small drone?
I think that'd be neat. Like exploring the Titanic without any water (or the pressure of the seafloor more than two miles below the ocean surface) making it difficult. Don't race in a building like that, though. There are better venues for that.
I'll close with reposting my own photo of this building, because I like both the shot and the building.