The panopticon prison was built primarily to accommodate relapsing prisoners, but ended up housing some of Argentina’s most dangerous criminals. It’s through the labor of the prisoners that the bulk of the town was built.
Ushuaia is the most southern city in the world at the very tip of Argentina. You must go through Chili to get there and take a Ferry to Tierra del Fuego which you are followed by lots of Commerson Dolphins. There is also a grand total of 4 boarder crossings just to get there.