Insane glitch? No clue.

[FurryEskimo]

Figure I'll just share a pic of what I found, spawned in my world.  I have zero Idea where this came from.  It's like dozens and dozens of prefabs all spawned ontop of each other, but I haven't the foggiest clue why.  I've been avoiding this part of my world because my game would slow to a crawl when I got anywhere near it, but not crash, and I figured something was wrong, but by logs didn't indicate anything like this was happening.  Thoughts?
From what I can tell, there are miltiple portals, stick bushes, spider nests, vines, marble statues, and maybe more.  I added some campfires to burn down some of the stuff, but I have no idea how this happened in the first place..  I don't think I have any mods that could have done this, but obviously it happened Somehow.
I don't expect anyone to really know, but I thought I'd share this oddity, in-case someone found it amusing.