Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 11, 2018 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 11, 2018 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 11, 2018 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Oct. 22, 2014 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Liu Dongjun)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 11, 2018 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows roads to the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 14, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Liu Dongjun)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows a valley to the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Aug. 8, 2015 shows folk artists posing for a photo before performing traditional "xuan" dance at Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Liu Dongjun)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Aug. 31, 2017 shows a villager watering the flowers at her hostel in Zhaburang Village in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Liu Dongjun)

Scenery of Zanda County in China's Tibet

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Photo taken on Aug. 31, 2017 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Liu Dongjun)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 11, 2018 shows the ruins of the Guge Kingdom in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)

Scenery of Zanda County in China's Tibet

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Photo taken on Sept. 10, 2018 shows the unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Zanda features the unique landscape of "earth forest" and well-preserved Guge Kingdom site. The ancient Guge Kingdom was founded around the 9th century but disappeared mysteriously during the 17th century. Ngari, at an average altitude of 4,500 meters, is nicknamed the "top of the roof of the world." It has always been the crown jewel for adventurers and archaeologists, and after them came tourists. (Xinhua/Purbu Zhaxi)