A trip onboard the Glacier Express is also a journey through unique flora and fauna. Admittedly though, the discovery of "Edelweiss" or Leontopdium alpinum and "Pinnate-leaved ragwort" or Senecio abrotanifolius from the panoramic viewing cars is just as elusive as discovering a marmot, ibex, red deer, golden eagle or bearded vulture. But it's good to know that the natural world here remains largely intact.