Menu: Files->Import→Topography...
This tool allow to get the topography of a region obtained from Internet. 
Find: allow to write a place name, like Barcelona, and then its latitude and longitude will be set
It is possible to navigate pressing the arrow buttons and increasing the level of detail, and also setting the latitude and longitude, or the name of some place.
It creates a grid of surfaces or quadrilateral elements.
Create background image: if set the current image map, obtained from OpenStreetMap or IGN are set as geo-referenced background image of GiD.