Exploring Abandoned Buildings

I love to explore abandoned buildings, much to the dismay of my mother.

There is something about walking through them and wondering what stories they might be able to tell.  I also wonder about what happened after they fell into disrepair.

In this building, I found a large circle made out of rocks.  What was the purpose for this?  Was it a group of Wiccans?  Was it a bunch of teenagers trying to rebel against their religious upbringing by experiencing with the occult?

The building knows all these answers, but it will never tell.