An Italian town did build a mirror to do that. https://www.vice.com/en/article/epnvzn/viganella-italy-fake-manmade-sun https://www.vice.com/en/article/epnvzn/v

An Italian town did build a mirror to do that. https://www.vice.com/en/article/epnvzn/viganella-italy-fake-manmade-sun https://www.vice.com/en/article/epnvzn/viganella-italy-fake-... [edit] Looks like a town in Norway did it as well, and theirs tracks the sun. https://www.theatlantic.com/photo/2013/10/using-giant-mirrors-to-light-up-dark-valleys/100613/ https://www.theatlantic.com/photo/2013/10/using-giant-mirror...