Officers from the municipal authorities of Huaian city perform red songs at the Huaian Great Hall of the People on June 13, 2011 in Huaian, Jiangsu Province of China. This year's celebrations will mark the 90th anniversary of the founding of the Communist Party of China. (Photo by ChinaFotoPress/Getty Images)

A man walks past specially designed wash basins in a public toilet at the Foreigners Street on April 26, 2007 in Chongqing Municipality, China. (Photo by China Photos/Getty Images)

A municipal worker sits on a bench, next to a statue, in Nizhny Novgorod, Russia, during the 2018 soccer World Cup, Thursday, June 28, 2018. Nizhny Novgorod was a “closed city” during the Soviet era. It was known as Gorky until 1990 and it was here that dissident scientist Andrei Sakharov was held under house arrest. Now the city hosts six World Cup matches and is teeming with tourists. That was unthinkable in the Soviet era and even rare now in a city that is seldom visited by outsiders. (Photo by Vadim Ghirda/AP Photo)

Residents with their empty containers crowd around a municipal tanker to fetch water in New Delhi, India, February 22, 2016. The Indian army has taken control of a canal that supplies three-fifths of Delhi's water, the state's chief minister said on Monday, raising hope that a water crisis in the metropolis of more than 20 million people can be averted. (Photo by Anindito Mukherjee/Reuters)

A general view shows a column of steam emerging from Popocatepetl volcano, after an increase in volcanic activity with steam and ash eruptions have been registered recently, according to local media, as seen from San Andres Cholula municipality, in the state of Puebla, Mexico on February 1, 2023. (Photo by Henry Romero/Reuters)

A solar-powered plane takes off from Jiangbei International Airport in southwest China's Chongqing Municipality, Tuesday, April 21, 2015. The Solar Impulse 2 departed Chongqing on Tuesday for a 1190-kilometer (642-mile) flight to the city of Nanjing in eastern China, the sixth leg of its around-the-world flight. (Photo by Chinatopix via AP Photo)

Women, with traditional clothes, collect rose petals at a rose field during rose harvesting season in Isparta, Turkey on June 17, 2020. The collected roses are exported to world wide known perfume factories, especially French companies, after the some process at the factories. Women wear traditional clothes to promote rose harvest with the support of Isparta Municipality. (Photo by Mustafa Ciftci/Anadolu Agency via Getty Images)

Iranian artist and designer Mehdi Ghadyanloo, with the help of the municipality, is slowly brightening up the city of Tehran one wall at a time. The 33-year old street artist has been painting murals and walls in Tehran for the last 5 years age, during which he’s reported to have painted over one hundred walls.