Next time someone tells you they live in a shoebox, you might want to take them seriously.

From tiny houses and monolithic domes, to real-life cave dwellings, subterranean abodes and yes, even the classic treehouse, the design concept of home is whatever you wish it to be.

Eco-friendly subterranean home. Image via boutique-homes.com

Pittsford, NY is home to the Mushroom House. Image via Forbes.com

Leaning toward more conventional conversions, however, Apartment Therapy takes an interesting look at 10 homes with history.