Formentera-based Marià Castelló Architecture has become known for creating incredible homes that deftly combine contemporary design with nature-based inspiration. The firm’s latest project is the Bosc d’en Pep Ferrer, a family home that was partially built deep underground into the rocky terrain to use the landscape as natural insulation to reduce its energy usage. Local architects have used the natural beauty of Spain’s Balearic islands as inspiration in their home designs for years.