Europe is the second-smallest continent (after Australia but second-most populous continent in the world. Europe is steeped in history, and it has the largest collection of historic buildings in the entire world. The vast majority of its population is of the "Caucasian race" and speak an Indo-European language. However, there are native European minority groups (some of which are the majority of individual nations) that speak non-Indo-European languages, and some nations have substantial recent immigrant populations from across the world.