In this introduction, I recall the main trends and evolutions in the conceptualisation and study of linguistic landscapes (LLs) and in language education studies that focus on the exploitation of LLs both as a pedagogical resource (especially in the language classroom) and approach in teacher training. The constituent chapters of the present book are situated at the intersection of three turns in applied language studies: the multilingual turn, the visual turn and the spatial turn. Following a detailed presentation of each section of the book and its chapters, I end with an acknowledgement of the potential of LLs for a more critical and agentive language education and teacher training.