Construction projects quite often have to grapple with odd planning laws and protesting locals. In Iceland, however, developers face an added complication: the huldufólk. These supernatural beings are an important part of the modern folklore of the island nation, and their presence still runs strong today. So much so, in fact, that builders have to be very careful not to upset them, for fear of suffering their elfin wrath. Read more in Oliver Wainright’s article on Iceland’s hidden people.