city depopulated of inhabitants and that often stays practically intact
A ghost town is a name for a city or town in which no one lives anymore. It can happen because of economical reasons (for instance, a town of gold miners who cannot find gold anymore), a natural disaster (a flood, a very long drought) or even a man-made disaster (for example, the nuclear fallout that emptied the town of Prypiat, Ukraine).
Some ghost towns are kept intact as tourist attractions. For example Craco, in the Italian region of Basilicata, is a destination for tourists and pilgrims, as well as a famous movie set for movies like The Passion of the Christ by Mel Gibson and Quantum of Solace by Marc Forster.