https://www.cnet.com/news/scientists-build-a-tiny-house-to-show-off-nanorobotics/

Tiny homes are all the rage with hipsters, minimalists and those who just want to scale down to a simpler style of living. But some tiny homes are just too small even for the most ambitious house hunters. 

This microhouse has a charing tiled-roof, side windows and more, but it's built on a foundation measuring 300 by 300 micrometers. The house itself is only about 20 micrometers long. One micrometer is 1/25,400th of an inch.