Iron lungs sit unused in an abandoned state hospital somewhere in the US. There are a handful of people left in the US who these machines, and now no company will provide parts or service for them. Yet these sit here, and probably still work. http://www.pprg.org/index.php?option=com_content=article=76%3Airon-lung-crisis=35%3Aresource-articles=58
The Serapeum, Egypt examined by members of the Laboratory of Alternative History. The diorite granite of these ancient boxes is perfectly planed and appears machine-cut. Ancient technology and unknown methods at work. Usage unknown.