Apologies for the poor image ... nevertheless, this is best viewed at original size.

In most parts of the world, 4,000 m of elevation would be too high for an alpine ski village; in Bolivia, it is home to a city of 2 million people.
La Paz is in an eroded badlands valley and adjacent high plain, with the glacier-capped peaks of Cordillera Real immediately to the east (not in photo).
Because the air is so lacking in oxygen at this elevation, the usual order of things is reversed – the rich live deeper in the valley below the CBD (centre left) and the poor in the sprawling ghetto of El Alto on the high plain (top right of photo).