When the Spanish photographer Govin Lapetule heard about the concept of a "small house", he got really excited by this idea.
Not every billionaire was born rich. In fact, many of them became wealthy previously living in poverty.
Originally bricks are formed out of clay, but in Karaba, a small African village in the southwest of Burkina Faso, bricks are mined directly from the hills.
Every year @guardiantravelsnaps selects the best mobile photos from around the world.