Mysterious Cave In The Woods - Who Made It & Why?

Today's video is a bit different than my normal videos. This is a location that i filmed 5yrs ago, but actually discovered over 20yrs ago. This cave is built into the side of a hill/small mountain. No idea why it was made or what is was used for, but my guess is it's something for channeling water. It's a unique and impressive structure and over time is showing signs of weakness as a wall has partially caved in. If you have any ideas or info about this, please share it with me in the comments section. Enjoy
Please Note: Exploring Abandoned locations can be dangerous. I don't condone or encourage anyone to enter an Abandoned structure. Not only is safety a concern, but often times its illegal and when possible, i seek out permission. I simply go to document its history before it's gone and leave things the way I find them. I assume all the risks & responsibility in doing so. Please don't attempt to do this on your own.
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