While the antecedents of second-home tourism can be traced back to the antique, as a modern phenomenon second-home tourism developed since the early decades of the 20th century. The scientific literature recognized second home tourism initially in the Nordic countries and North America, and particularly the work of Wolfe on second homes in Canada established an early understanding of the spatial dimensions of the phenomenon. An increasing personal mobility owing to car ownership entailed a growth in second homes in the Western world. Coppock's Second Homes: Curse or Blessing? (1977) marked an early peak in the growing concern regarding the impact of second homes on rural communities and the environment. Since the 2000s second home tourism research has revealed an increasingly comprehensive picture of a global phenomenon. This chapter focuses primarily the literature on the topic since the publication of the previous edition in 2014. Before the content of the research contributions is addressed, it can be noted that the development of scientific inquiry is developing geographically and indeed, today research on second homes can be seen from all parts of the world, also nuancing the phenomenon in relation to geographical settings and preconditions. Nevertheless, Nordic research on second homes continues to hold a dominant position.