It's said that Ushuaia is the southernmost city in the world. In the province of Tierra del Fuego, it's the only city in Argentina on the Pacific Ocean. It's named in a Spanish approximation of the aboriginal name given to it by the Yahganes, in a nearly extinct language (Yagan) with only one speaker still living.
The area was largely unsettled and many native populations survived with little interference until the turn of the 20th century. The influx of western cultures largely killed off populations of Selknam, Haush, Yamana, and Kawésqar peoples.
Today there are many winter resorts, museums, and a large tourism industry. There are scads of boat tours available to see the unusual terrain and animal life unique to this region of the world.
Photo of Ushuaia Valley: largerich