Ushuaia, located in the province of Tierra del Fuego, is the world's southernmost city. About 100,000 people live in the city, and it is from here that you sail south, if you want to travel to Antarctica. Ushuaia is an old prison colony, and you can still visit the city jail, now a museum. Besides the museum, there are plenty of activities such as trekking in the nearby national park, hiking in the mountains/glaciers behind town (you can take a ski lift up there all year round), horse riding and sailing. The city also has a lot of restaurants and you simply have to taste their delicious fresh king crab and beaver carpaccio, which are some of the area's specialties.