I grew up in a house with a basement with concrete walls. When I complained about the summer heat, I always heard: 'Basement!!' Makes me wonder if heat waves (

I grew up in a house with a basement with concrete walls. When I complained about the summer heat, I always heard: 'Basement!!' Makes me wonder if heat waves (or cold waves) were the cause of most of the world's cave paintings. Or the underground cities of the Middle East.