Chapter 6 told of Steinert Hall, an abandoned concert hall below street level in Boston, that I was able to explore in 1972. There are several videos now, so that you can get a sense of what it looks like. All of them have lighting, so it does not look near as spooky as the day we walked in with just a couple of flashlights.
Here is a link to a video that is fun to watch:
I hope you enjoy it.