Stumbling around the interweb as I do each day, I discover so many things.  I'll admit it, most are pretty useless.  However, this video from youtube.com really struck me.  It's about old unexplained structures around the world. And it got me to thinking about old structures I discovered wandering around the hills in central Missouri.  What about Montana?  I've only lived here a couple years, are there any places where there are some unexplained structures here?