It's that time of year again. National Geographic has once again launched its photography contest. The grand prize winner will win a $10,000 prize and a trip to National Geographic's headquarters in Washington, D.C.

It already has more than 1,500 entries in three categories (people, places and nature), so you'd better get on it! For inspiration, here are six of the editors' favorites so far.

National Geographic is accepting submissions now through November 30; click here to find out more about entering and to see some of the most recent submissions.

Captions and images by individual photographers; courtesy of National Geographic.

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  • The Explosion!

    The subject's name is Busaba, a well cared for Indochinese Tigress whose home is at Khao Kheow Open Zoo, Thailand. I had taken many portraits of Busaba previously and it was becoming more and more difficult to come up with an image that appeared any different to the others. Which is why I took to observing her more carefully during my visits in the hope of capturing something of a behavioural shot. The opportunity finally presented itself while watching Busaba enjoying her private pool then shaking herself dry. In all humility I have to say that Mother Nature smiled favourably on me that day! <em>Photo and caption by Ashley Vincent/National Geographic Photo Contest</em>

  • A race that follows in the path of the famous explorer Roald Amundsen brings the contestants to the Hardangervidda Mountainplateu, Norway. 100km across the plateau, the exact same route Amundsen used to prepare for his South Pole expedition in 1911 is still used by explorers today. Amundsen did not manage to cross the plateau and had to turn back because of bad weather. He allegedly said that the attempt to cross Hardangervidda was just as dangerous and hard as the conquering of the South Pole. The group in the picture used the race as preparations for an attempt to cross Greenland. Photo and caption by Kai-Otto Melau/National Geographic Photo Contest

  • Govida players at Dahi Handi fest in Mumbai

    Govinda players gather together under Dahi Handi to making a human pyramid to catch and then break an earthen pot high in the air with the help of a rope, in order to win the set prizes. -- Janmashtami and Dahi Haandi was celebrated in Mumbai. Govindas (young men) form a human pyramid to reach the dahi handi and try to break it in a bid to win prizes. <em>Photo and caption by Money Sharma/National Geographic Photo Contest</em>

  • Holy colors

    I shot this photograph at an ancient temple dedicated to lord Jyotiba,Maharashtra,India.Devotees and tourists throng to this in the full moon days and Sundays (sunday is sacred to Jyotiba) and due to scattering of ëGulalí(vermilion) the temple premises is turned pink. I shot this pic on a Monday morning. <em>Photo and caption by aditya waikul/National Geographic Photo Contest</em>

  • Secluded Pier at Lake Brunner

    I was on my 170km solo cycling trip around West Coast, New Zealand and one of the destinations was this famous Lake Brunner. I reached this pier in one foggy morning and I found this moment was ìlike no otherî. <em> Photo and caption by MOHD NADLY AIZAT MOHD NUDRI/National Geographic Photo Contest</em>

  • Atlantic Spotted Dolphins having an underwater chat

    These three Atlantic Spotted Dolphins were acting playful for a few minutes so I swam over to join in. When I got close the dolphins came together as if they were going to discuss my presence. One of them seemed to say something then they did a little dance and were on their way. Amazing animals, I felt very lucky to capture the moment. <em>Photo and caption by John Gaskell/National Geographic Photo Contest</em>