Fireplaces. A good technology that the modern world is abandoning with all the 2030 agenda and the urbanization process. I used to live in apartment for 20+ years. Now I live in the country and I use the chimney as much as I can (I am in winter right now). You can heat up your spaces, read a book next to the fire and even cook a home made pizza. Well, the technology is actually fire. "Invented" quite a few years ago.