A huge, new city is being built in Sweden, but it’s not being constructed using steel or concrete — its main building material is wood. Part of the Swedish capital, Stockholm, is set to become the “world’s largest wooden construction project,” according to its developer Atrium Ljungberg, which will invest 12 billion Swedish krona (about $1.25 billion) into the project. Sickla — an industrial area to the south of Stockholm’s center once known for manufacturing diesel engines — is being redeveloped using cross-laminated timber, with the material being used in its buildings’ core, floors and walls. The new wooden homes, offices, schools and stores, will be interwoven with older structures, some of which have been converted into libraries or cinemas, and the area will extend to 250,000 square meters, or around 2.7 million square feet.