When Dateline visited China's vast empty cities in 2011, it became one of our most popular stories ever with over three million views online.
So are the uninhabited towns now bustling with residents? And is the building of unwanted homes and businesses still continuing?
Adrian Brown returns to China for Dateline to answer those questions; and finds 20 new cities are taking shape in this year alone.
There's already a near deserted replica of Paris complete with its own Eiffel Tower and Champs Elysees, while even levelling a range of 700 mountains can't stand in the way of another vast new conurbation.
With China's population and prosperity growing at a rapid rate, Adrian also asks an expert if it's all good urban forward planning or an economic bubble that's about to burst.
Follow Adrian on his latest tour of China's Empty Cities above, and see his blog and satellite views of the cities below.
Adrian writes for the Dateline blog about his return to China’s empty cities, and the mixed response to all the media attention":
China, frankly, has grown weary of endless reports about its severely under populated cities. That’s why the provincial government of Inner Mongolia refused to issue me with an invitation letter. Maybe they'd seen my earlier Dateline report on China’s Ghost Cities.
Anyway, the coaxing and cajoling failed, and no letter was forthcoming. So in the end I had to visit Ordos and its Kangbashi New Town unofficially.
Arriving in the city, I am struck by the similarity with North Korea's capital, Pyongyang. Wide, empty boulevards. Grandiose architecture with confused themes. And an eerie shortage of people. At times you have to pinch yourself and say, "Yes, it's real."
Our cover was blown within a few hours of arriving though. My tour guide was suspicious of my endless questions about why the place was so empty. Eventually her boss turned up, along with an official from the Public Security Bureau.
After checking my passport, their suspicions were confirmed"¦ no journalist visa. Strangely I was told that while this meant I did not have permission to talk to anyone, I could continue filming.
But eventually, it was clear I had overstayed my welcome and was told I would be driven to the airport"¦ just four hours after arriving. I was being politely deported from China’s biggest ghost city. I joked to my guide, 'but don’t you need people."
'Yes, but not like you," she replied sharply.
But more than 700 kilometres to the south, the welcome could not have been more different. The officials behind Lanzhou New Area, a new city being carved out of the mountains of Gansu Province, seemed overjoyed to receive us.
I was encouraged to pose for pictures with the deputy mayor and other senior local party members. I was also invited to give my views on China’s newest city to the local media"¦ less than two hours after arriving in Lanzhou.
In this lunar landscape they are are levelling 700 mountains to build a 130,000 hectare metropolis from scratch. Up to a million people will eventually move in.
The new city’s Deputy Mayor, Guo Zhiqiang, told me the city will not repeat the mistakes of Ordos.
The satellite images of the empty cities in Adrian's report show their scale and in many cases the lack of signs of life...
Tianducheng is a replica of Paris, complete with its own Eiffel Tower, grand boulevards and French-style architecture.
The image of the South China Mall in the southern city of Dongguan is partially obscured by cloud, but its scale can still be seen.
Ordos is one of the most famous ghost cities. Closer inspection shows its massive scale, but the lack of cars on the streets.
Lanzhou New Area is currently being built near the existing city of Lanzhou. The surrounding landscape shows why 700 mountains needed to be levelled to make way for it.
Find out more by using the interactive Google images above and by following the links on the right-hand side of the page.