Day 1 Ushuaia, Argentina

At 55 degrees latitude south, Ushuaia (pronounced oo-swy-ah) is closer to the South Pole than to Argentina's northern border with Bolivia. It is the capital and tourism base for Tierra del Fuego, the island at the southernmost tip of Argentina.Although its stark physical beauty is striking, Tierra del Fuego's historical allure is based more on its mythical past than on rugged reality. The island was inhabited for 6,000 years by Yámana, Haush, Selk'nam, and Alakaluf Indians. But in 1902 Argentina, eager to populate Patagonia to bolster its territorial claims, moved to initiate an Ushuaian penal colony, establishing the permanent settlement of its most southern territories and, by implication, everything in between.When the prison closed in 1947, Ushuaia had a population of about 3,000, made up mainly of former inmates and prison staff. Today the Indians of Darwin's "missing link" theory are long gone—wiped out by diseases brought by settlers and by indifference to their plight—and the 60,000 residents of Ushuaia are hitching their star to tourism.The city rightly (if perhaps too loudly) promotes itself as the southernmost city in the world (Puerto Williams, a few miles south on the Chilean side of the Beagle Channel, is a small town). You can make your way to the tourism office to get your clichéd, but oh-so-necessary, "Southernmost City in the World" passport stamp. Ushuaia feels like a frontier boomtown, at heart still a rugged, weather-beaten fishing village, but exhibiting the frayed edges of a city that quadrupled in size in the '70s and '80s and just keeps growing. Unpaved portions of Ruta 3, the last stretch of the Pan-American Highway, which connects Alaska to Tierra del Fuego, are finally being paved. The summer months (December through March) draw more than 120,000 visitors, and dozens of cruise ships. The city is trying to extend those visits with events like March's Marathon at the End of the World and by increasing the gamut of winter activities buoyed by the excellent snow conditions.A terrific trail winds through the town up to the Martial Glacier, where a ski lift can help cut down a steep kilometer of your journey. The chaotic and contradictory urban landscape includes a handful of luxury hotels amid the concrete of public housing projects. Scores of "sled houses" (wooden shacks) sit precariously on upright piers, ready for speedy displacement to a different site. But there are also many small, picturesque homes with tiny, carefully tended gardens. Many of the newer homes are built in a Swiss-chalet style, reinforcing the idea that this is a town into which tourism has breathed new life. At the same time, the weather-worn pastel colors that dominate the town's landscape remind you that Ushuaia was once just a tiny fishing village, snuggled at the end of the Earth.As you stand on the banks of the Canal Beagle (Beagle Channel) near Ushuaia, the spirit of the farthest corner of the world takes hold. What stands out is the light: at sundown the landscape is cast in a subdued, sensual tone; everything feels closer, softer, and more human in dimension despite the vastness of the setting. The snowcapped mountains reflect the setting sun back onto a stream rolling into the channel, as nearby peaks echo their image—on a windless day—in the still waters.Above the city rise the last mountains of the Andean Cordillera, and just south and west of Ushuaia they finally vanish into the often-stormy sea. Snow whitens the peaks well into summer. Nature is the principal attraction here, with trekking, fishing, horseback riding, wildlife spotting, and sailing among the most rewarding activities, especially in the Parque Nacional Tierra del Fuego (Tierra del Fuego National Park).

Day 5 Port Charcot, Antarctica

Day 10 Marie Byrd Land, Antarctica

Day 11 Marie Byrd Land, Antarctica

Day 12 Marie Byrd Land, Antarctica

Day 13 Marie Byrd Land, Antarctica

Day 14 Marie Byrd Land, Antarctica

Day 15 Marie Byrd Land, Antarctica

Day 16 Marie Byrd Land, Antarctica

Day 22 Balleny Islands, New Zealand

Day 25 Macquarie Island, Tasmania, Australia

Macquarie Island is a UNESCO World Heritage Site due to its major geoconservation significance. It is the only island in the world that is entirely composed of oceanic crust and rocks from the mantel. The unique diversity of the island makes it a truly remarkable place to visit. Sand Bay is located on the east coast where you will find Royal and King Penguin rookeries as well as Southern Elephant Seals, and if the weather permits, you will have the opportunity to get closer on a Zodiac®.

Day 29 Hobart, Tasmania, Australia

Straddling the Derwent River at the foot of Mt. Wellington's forested slopes, Hobart was founded as a penal settlement in 1803. It's the second-oldest city in the country after Sydney, and it certainly rivals its mainland counterpart as Australia's most beautiful state capital. Close-set colonial brick-and-sandstone shops and homes line the narrow, quiet streets, creating a genteel setting for this historic city of 215,000. Life revolves around the broad Derwent River port, one of the deepest harbors in the world. Here warehouses that once stored Hobart's major exports of fruit, wool, and corn and products from the city's former whaling fleet still stand alongside the wharf today.Hobart sparkles between Christmas and New Year's—summer Down Under—during the annual Sydney-to-Hobart yacht race. The event dominates conversations among Hobart's citizens, who descend on Constitution Dock to welcome the yachts and join in the boisterous festivities of the crews. The New Year also coincides with the Tastes of Tasmania Festival, when the dockside area comes alive with the best of Tasmanian food and wine on offer in numerous cafés, bars, and waterfront stalls. Otherwise, Hobart is a placid city whose nightlife is largely confined to excellent restaurants, jazz clubs, and the action at the Wrest Point Casino in Sandy Bay.The Hobart Tasmanian Travel and Information Centre hours are weekdays 8:30–5:30 and Saturday 9–5.