Climbers are increasingly threatened by the collapse of craggy peaks as the permafrost binding them melts.

The national park marks the edge of the country's highlands, with spectacular views, craggy peaks and dizzying precipices.

We set off up an uninhabited valley amid shortbread-tin scenery, autumnal trees, craggy peaks, still, deep water.

Everyone will be rewarded with spectacular views of craggy peaks, alpine tarns, waterfalls, glaciers, alpine flowers and mountain fauna.

Glaciers move through the mountains like slow-motion rivers carving deep valleys and craggy peaks.