When I was a kid we built one like that. My grandfather was a stone mason, and had a lot of heavy equipment so over a few years we found all these giant red sandstone boulders along lake superior and he'd check em out & once in a while would haul one back and stand them up. It was really cool, but after we moved away and our home became our cabin, it was 15 years before I came back to visit, and when I went back out there, it had already crumbled. Making stone things hollow above ground in this climate is a short term gig. The extreme temp swings cause microfractures which moisture migrates into immediately and every winter it gets considerably worse. When you have just one side of a rock exposed, it's not nearly as bad, but when you have a rock that's got different things happening on every side of it, no good. Also why the native dudes built out of wood around here. Their attempts at stone never lasted.
Alexander Gomez
last time i was able to find a page that had a slider where you could set the time of day, but i still couldnt get them to actually save as a gif file. it was odd