“Spain has its Kilometre Zero in the centre of the Puerta del Sol in Madrid (incidentally, the clock of the old Royal House of the Post Office, in front of which the plaque is located, marks the official time in Spain, according to the urban legend). The plaque that marks this point was turned around 180 degrees in 2002 because the map of Spain depicted on it was upside down in relation to the modern depiction of Spain.” Source.