Peter Gedei: The famous hall "Halle der Circe" is located at the end of the highest-lying touristic cave in the world (2100 m alt.), which can be reached only by experienced cavers. With proper lighting the permanent ice in the hall shines in beautiful blue tones, which add enchantment atmosphere to the frozen hall.2015 National Geographic Traveler Photo Contest
Marja Schwartz: Lion cub jumping on mother’s head, Naboisho Conservancy, Masai Mara, Kenya, Africa. 2015 National Geographic Traveler Photo Contest
Christine Hess: There's nothing quite like being able to stand at the base of Niagara Falls as you feel and hear the thundering roar of the water as it falls over the edge and plunges 170' down to the Niagara River.2015 National Geographic Traveler Photo Contest
Jassen T: Sunrise at Grand Prismatic Spring, Yellowstone National Park, Wyoming. Aerial Image. If you look carefully, you might notice the person enjoying this natural beauty.2015 National Geographic Traveler Photo Contest
Dale Johnson: The Rock restaurant just off shore in Zanzibar. As the sun set, I was taking photos of The Rock before going out there to have dinner. As the light levels dropped, the light came on in the restaurant and I knew I had my shot.2015 National Geographic Traveler Photo Contest
James Smart: Beautiful tornado tracks in open farm land narrowly missing a home near Simla, Colorado.2015 National Geographic Traveler Photo Contest
Felicia Simion: A 6-year-old boy imitates the elder shepherds of a small Romanian village.2015 National Geographic Traveler Photo Contest
Camel Ardah: As it called in Oman, its one of the traditional styles of camel racing between two camels controlled by expert men, the faster camel is the loser one, so they must be running by the same speed level in the same track. 2015 National Geographic Traveler Photo Contest
Derek Gerstmann: The late afternoon sun shines down on the Gorner Glacier above the Swiss town of Zermatt. The radiant heat offers enough warmth to let algae grow in the snow and cast a pink hue with their growth. The seasonal weather also causes the ice to crack and melt, which causes rivers and waterfalls to form from the runoff and cascade down the giant rock face of Monte Rosa Massif. 2015 National Geographic Traveler Photo Contest
Yosuke Kashiwakura: The island of Borneo, which is split between the countries of Malaysia, Indonesia, and Brunei, was once covered with a lush tropical rainforest, but in the wake of ongoing deforestation and the expansion of plantation farming, the habitats of the islands endemic and endangered species are being destroyed rapidly. Relentless deforestation has precipitated the loss of 90% of the orangutan population in 100 years. At this rate, some expect this species to become extinct within the next 20 years. 2015 National Geographic Traveler Photo Contest
Sophie Carr: This is taken at the volcanic beach at Stokksnes in south-eastern Iceland in February 2015. I used a 2-second exposure to capture the water trails as the waves receded over rocks at the edge of the beach, just as the sun was setting behind me, illuminating the mighty Vesturhorn mountain and some peaks in the far distance. 2015 National Geographic Traveler Photo Contest
Bonnie Stewart: The little tarsier, nicely nestled in a leaf, suddenly opens its eyes! They are nocturnal so what a surprise. These tiny primates (3 to 6 inches) are found only in the Philippines and most of them are in sanctuaries. This one was in a sanctuary in Bohol Island. 2015 National Geographic Traveler Photo Contest
Christopher R Gray: I visited Deadvlei in 2008. The personal emotional and spiritual connection I felt with "The Beginning" I know I had to return someday. That time came in May of 2015. I knew I had to make a photograph that reflected how I felt during my first visit and on this visit. I did capture it. I fell it was not just a sense of place but a sense of time. 2015 National Geographic Traveler Photo Contest
Felicia Simion: I was working at my family farm some 150 km from the Calbuco Volcano when a friend called me and told me what was happening, I took my camera and tripod and drove to Puerto Varas where a quiet chaos was ensuing and decided to keep on driving to darker area. Upon arrival the volcano was quiet again, not even vapour coming out so a little disapointed I went to rest. Two hours later hell broke loose and I could take some of the pictures I was dreaming about ever since Chaiten eruption in 2008. 2015 National Geographic Traveler Photo Contest
Marc Henauer: Every year, humpback whales come to Kingdom of Tonga during July to September. The mothers raise their babies and when they are enough strong they go far away to the cold water. During whale watching activity, you can live some incredible experiences by interaction with this fabulous mammal. This young calf played with me during 30 minutes under the control of his mother, a great memory. 2015 National Geographic Traveler Photo Contest
From a volcano erupting in Chile to a lion cub jumping on its mother’s head in the Masai Mara - these are some of the stunning images submitted to the National Geographic Traveler Photo Contest.
It is the 27th year of the annual photography competition, which awards the best travel images captured around the globe.
Photographers have so far captured the energy of a camel race in Oman, sunrise at Yellowstone's Grand Prismatic Spring and a now-endangered orangutan in what is left of Borneo's tropical rainforest.
The top prize is an eight-day expedition to Costa Rica and the Panama Canal - and there is still time to enter before June 30 at
Entries will be judged on "creativity and photographic quality".