Port Lockroy, a natural harbor located in the heart of the Antarctic Peninsula, is not only home to a colony of more than 3,000 gentoo penguins; it's also an official British post office. Originally the site of a British research station, the location has since been converted into a museum and post office, offering the many passing cruise ships a place to dock and unload passengers for a unique Antarctic experience. As a result, it's now one of the most popular tourist spots in the Antarctica, playing host to more than 18,000 visitors from all around the world during a four-month summer window. 

On Jan. 28, PBS's acclaimed NATURE documentary series will spotlight Port Lockroy in "Penguin Post Office," offering viewers a unique and up-close look at this remote British outpost. The one-hour special, filmed during the 2013-2014 Antarctic summer, chronicles the lives of the gentoo penguins and the staffer from the United Kingdom Antarctic Heritage Trust who run the post. According to the trust, some 70,000 cards are posted each year from the site, taking two to six weeks to reach their destinations. 

"Penguin Post Office" airs on Jan. 28 at 8 p.m. on PBS. Check out an overview in the video above and a clip from the episode in the video below. 

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