Small spaces are the next big thing in real estate, and with good reason.
Real estate is constantly getting more expensive, and we're facing overpopulation and environmental damage. Tiny homes can help solve these issues, but many also prefer them to traditional housing because they're the perfect hybrid of comfort and convenience, since they are often mobile.
On roofs, wheels, and in backyard, here are 23 of the smallest homes we could find around the world.
Melissa Stanger contributed to an earlier version of this story.
A Colorado couple built this 124 square-foot home that has a kitchen, bathroom and sleeping loft.

Size: 124 sq. ft.
Location: Colorado
Colorado couple Christopher Smith and Merete Mueller began building their home back in 2011 and documented the journey in a new movie called "TINY: A Story About Living Small."
The house has a small galley kitchen, a bathroom, and a sleeping loft nestled between the floor and the 11-foot-high ceilings. For storage, the couple makes use of a small closet and two built-in bookshelves, and works from a built-in desk a reclaimed hardwood table.
KODA Walking Concrete made the World Architecture Festival's shortlist of the best "Small Projects" in 2016.

Size: 250 sq. ft
Location: Tallinn, Estonia
This cubic concrete home is completely mobile and has technology that allows it to learn and adjust to its surroundings. The company that developed it, Kodasema, designed the two-tiered home so that it can be assembled in as little as four hours.
The simple design allows it to function as whatever space is needed, be it a beach house, mountain hut, café, or office.
This 196 square-foot home cost its architect less than $12,000 to build.

Size: 196 sq. ft.
Location: Boise, Idaho
Boise architect Macy Miller decided to downgrade from a full-size home to a tiny one, which she designed and built herself. She lives there with her partner and dog.
The home, which sits on top of a flatbed trailer, cost about $11,500 all in. The most expensive component is the composting toilet — about $2,000 — which uses barely any water.
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