This combination of satellite images released by Copernicus, the European Union's Earth observation program, shows a massive quarantine camp built in Shijiazhuang in China's Hebei province. China is building a COVID quarantine center with more than 4,000 rooms in the northern city of Shijiazhuang, at a speed that's rarely seen in other countries. The satellite images show dramatic changes over 10 days in an area where there had been only flat land before construction started on Jan. 13, 2021. (European Union, Copernicus Sentinel-2 imagery via AP)