A very long time ago, I would remember going to my grandparents half buried underground cellar. The moldy, musty, mildewy smell was terrible at the time. I miss that now and wish I had one. I bet I could spend hours in there now escaping from the hot weather in that nice cool, damp air room. They built it out of creek rocks and put a tin roof over it and later replaced the roof with shingles. I sure do miss the olden days!