Set in rolling grassland near the foot of the Rocky Mountains, Calgary is Canada's fourth-largest city. It is also one of its youngest; as late as the 1870s the area was settled with rough wooden shacks, home to native Canadians and whisky traders from the nearby prairies. The coming of the railroad brought an influx of people and a wealth of trade for the ranching industry. By the early 20th century, oil was discovered in the region; this cemented Calgary's position as one of North America's most important cities. Now with a lively, affluent atmosphere, Calgary has much to recommend it.