Puerto Williams, Chile

Puerto Williams holds the distinction of being the southernmost city in the world — a title it claims with the calm certainty of a community that exists at 54°S latitude on the Beagle Channel, surrounded by the sub-Antarctic forests and glaciated peaks of Isla Navarino in Chilean Tierra del Fuego. The Argentine city of Ushuaia, across the channel, disputes this claim, but Puerto Williams' latitude places it definitively further south.

The town's setting is spectacular: the Dientes de Navarino — 'Teeth of Navarino' — a jagged range of peaks rising behind the settlement, provide the most southerly trekking circuit in the world. This multi-day hike traverses sub-Antarctic forests of lenga beech, crosses high-altitude passes with views to Cape Horn, and encounters beaver dams built by an invasive Canadian beaver population whose descendants have been reshaping Tierra del Fuego's hydrology since their introduction in the 1940s.

The Martín Gusinde Anthropological Museum documents the Yaghan people — the original inhabitants of these channels, whose ancestors navigated these waters in bark canoes for over six thousand years and whose resistance to clothing in sub-Antarctic temperatures astonished European explorers. Cristina Calderón, the last full-blooded Yaghan speaker, lived in Puerto Williams until her death in 2022, representing the end of one of humanity's oldest linguistic traditions.

Seabourn and Silversea include Puerto Williams on Patagonian and Antarctic expedition itineraries, with the town serving as both a port of call and a departure point for Cape Horn and Drake Passage crossings. The Beagle Channel itself — named for Darwin's ship — provides sailing through waters where Magellanic penguins, sea lions, and the black-browed albatross with its enormous wingspan are regular companions.

November through March provides the most navigable conditions, with December and January offering the longest days and the mildest temperatures — though 'mild' at this latitude means the kind of weather that makes the ship's hot chocolate an essential amenity rather than a luxury. Puerto Williams is the end of the road — quite literally — and the beginning of the Antarctic realm that stretches south to the pole.