The ancient city that's crumbling away

The ancient city of Mohenjo Daro was one of the world's earliest major urban settlements - but as Razia Iqbal found on a recent visit to Pakistan, its remains are in danger of crumbling away. As a lover of language, I am convinced that certain combinations of letters have in them some innate magic - like Kubla Khan, or Xanadu, or Nineveh.