This film, three years in the making, The remote forests of Kalkalpen National Park in Austria, the largest area of wilderness in the European Alps, have been left untouched by humans for nearly a quarter of a century in order to return to their natural, primeval state. The landscape regenerates itself in dramatic cycles of growth and decay, and this bold hands-off method of conservation yields salient results: the lynx, absent from the area for 115 years, has returned.

• Documentary