San Jerónimo, Colombia

San Jerónimo, just outside Medellin, has become the first town in Colombia to build a sustainable school that offers an education close to nature.

The school is made of recycled glass bottles, aluminum cans, tires and cardboard and took only 24 days to build.

It uses solar energy, an independent water system, has its own vegetable gardens, an experimental classroom and a curved, geodesic dome for food production and biodiversity.