North Korean leader Kim Jong Un has opened a flagship construction project close to Mount Paektu, a symbol of the Korean nation and officially the birthplace of his father and predecessor, state media reported on Tuesday.
The city is named Samiyon and North Korean state media called the city the "epitome of modern civilisation".
It features new apartments, hotels, a ski resort and relevant commercial, cultural and medical facilities.
In his 2019 New Year's Eve Address, Mr Kim described it as the "ideal socialist village".
The ceremony was held in the snow before thousands of soldiers and civilians and was portrayed as a demonstration of the resilience of the North, which is subject to international sanctions imposed over its nuclear weapons and ballistic missile programs.
It comes with time running out on Pyongyang's demand for the US to offer it fresh concessions by the end of the year, and ahead of Kim's New Year speech on 1 January, a key political set-piece in the isolated country.
Winter already has North Korea's far north firmly in its grip, and icicles hung from buildings, Korean Central Television (KCTV) footage showed - the largely empty streets covered in snow.
Banners proclaimed: "Long live the great leader of the force of our party and country, comrade Kim Jong Un!"
Mr Kim had "worked heart and soul to turn Samjiyon County, the sacred place of the revolution, into the utopia town under socialism", the official KCNA news agency said.
The Korean people were, it said, "advancing along the straight road chosen by themselves without any vacillation despite the worst trials".
Nuclear negotiations with the United States have been deadlocked since the Hanoi summit broke up in February, and Pyongyang has issued a series of increasingly assertive comments in recent weeks as its time limit approaches.
In a separate report Tuesday, KCNA quoted vice foreign minister Ri Thae Song saying: "What gift the US receives for Christmas depends entirely on the US' decision."
Riding a white horse
Pyongyang has poured huge resources into the rebuilding of Samjiyon, the closest town to Mount Paektu, a dormant volcano that straddles the border with China.
Mr Kim is closely associated with the scheme and has visited the area several times, reportedly riding a white horse to the mountain's summit in October, with fresh photos surfacing of him on the horse today.
The vast Samjiyon project includes a museum of revolutionary activities, a winter sports training complex, processing plants for blueberries and potatoes, and 10,000 apartments.
The city could accommodate more than 4 000 families and has 380 blocks of public and industrial buildings.
Thousands of workers swarmed over the site during construction, AFP saw, many of them soldiers.
Much of the North Korean army is devoted to construction.
Students have been sent to work on the scheme during university holidays, KCNA reported previously, while diplomats say children have also been deployed.
According to North Korean propaganda, Kim Jong Il was born at the nearby Mount Paektu Secret Camp where his own father Kim Il Sung was fighting the Japanese - although independent historians and Soviet records say he was actually born in Russia, where North Korea's founder was in exile.
The official story plays a central role in Pyongyang's teachings about the Kim family, who have led the country for three generations, and every year 100,000 or more students and workers are taken on study trips to the area.
