Size: 100 sq. ft.

Location: Edinburgh, Scotland

This home is called the "Eco-cube." At 10 cubic feet, it's still sizeable enough to hold a small living room, dining area, kitchen, washer and dryer, a closet, full shower, toilet, and full-sized bed.

It was designed by Dr. Mike Page of the University of Hertfordshire and founder of the Cube Project, an initiative created to prove that a person could "live a comfortable, modern existence with a minimum impact on the environment." Thanks to its solar panels, the Eco-cube can earn you $1,600 a year through the UK's feed-in tariff.