I have just come back from Mars. Or, at least, a place so unearthly that it is what I imagine snapshots from a holiday jaunt to Mars – or Uranus, or Jupiter – would look like. Black pitted landscapes of rippling rock. Mineral-rich conical mountains in shimmering oranges and emerald greens. Chalk pinnacles that rise out of the sand in shapes that seem to have fallen straight out of a surrealist painting. It’s a thoroughly alien environment supplanted firmly on earth. This is Egypt’s Western Desert.