Travel Cruising to the ‘end of the world’ and Earth’s southernmost city: Ushuaia, Argentina January 13, 2020 Dan Fellner, Special for The Republic Comments Off on Cruising to the ‘end of the world’ and Earth’s southernmost city: Ushuaia, Argentina Ushuaia, Argentina, may or may not be the southernmost city on the planet, but touring this part of South America by cruise ship is a peak experience.