Re: Why are there only two cities in the future? (spoilers)
Well Paris is one of the more popular cities to destroy. Along with places like New York, London and Tokyo. But I guess it comes down to a story telling point of view. Certain cities are more regonised globally.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.