Two photographers takes photos at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

Photo taken on April 21, 2016 shows the scenery in Death Valley National Park in United States. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

Photo taken on April 21, 2016 shows the scenery in Death Valley Naiontal Park in . Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

A photographer takes photos at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

A couple are seen at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

Travellers visit the Badwater at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

A couple are seen at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

A traveller is seen at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

Photographers pack their stuff and prepare to leave at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei)

Photo taken on April 21, 2016 shows the scenery in Death Valley National Park in United States. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei) 10

Photo taken on April 21, 2016 shows the scenery in Death Valley Naiontal Park in United States. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei) 11

A traveller is seen at Death Valley National Park in the United States on April 21, 2016. Death Valley National Park is located in California and Nevada in the United States. The park occupies an interface zone between the Great Basin and Mojave Desert and contains a diverse desert environment of salt-flats, sand dunes, badlands, valleys, canyons, and mountains. It is the hottest and driest of the national parks in the United States. Death Valley became a national park in 1994. (Xinhua/Yang Lei) 12