South Pole, Antarctica
At the southern pole of the planet, another light show is going on. The aurora australis, or Southern Lights, are a near-mirror to the northern ones. And if you're able to snag a spot at one of the research facilities in Antarctica, you'll experience it.
The South Pole, being the South Pole, has a prime location in the Auroral Zone. It sits farther south of the Antarctic Circle than any other spot on the map (naturally), and the Southern Lights are a regular occurrence here. On the downside, the continent is inhospitable, to say the least. Tours and cruises do go there during the more manageable times of year, but winter is the best time to see the lights [source: IAATO]. Still, the Antarctic tourist season offers the best chance out there for seeing the aurora australis.
However, there are more-hospitable locations where visitors might catch a glimpse -- if the sun is in a particularly active state -- places like Southernmost Australia.