With jagged rock spires, expansive glaciers, picturesque fjords and sweeping grasslands, this vast region east of the Andes is rugged and breathtakingly beautiful. Much larger than its Chilean counterpart, Argentine Patagonia has enticed adventure travelers — and adventurous outlaws, like Butch Cassidy and the Sundance Kid — ever since Captain Robert FitzRoy landed the HMS Beagle there in 1833. Most visitors come between December and mid-April, when it is warmer but windier. They travel to see the massive Perito Moreno Glacier, one of the most important freshwater reserves in the world, near El Calafate; El Chaltén, the climbing mecca near Mount Fitz Roy; and Tierra del Fuego, the dramatic archipelago that is the jumping off point to Antarctica. Until recently, intrepid travelers with a taste for luxury would opt for the Chilean side, but Argentine Patagonia is catching up, offering plush lodgings in which to unwind after a day of hiking, trekking, climbing and sightseeing.