Watch - the house that spain printed

Solar energy has been around for years, but one house in Barcelona has taken it in a surprising new direction. Solar House 2.0, built this year on thecity's waterfront, uses the time-tested green energy but combines with it modern technology to create something unique: a 3D-printed, solar-optimised building.

Mathematically adjusted and pre-fabricated on computer before being assembled on the site, the house was built in just two weeks.

And the most revolutionary part? If you want to print your own home, the Barcelona building plans are open source and available to anyone for free.

Take a look behind-the-scenes at how the building was made: