1. The railway cuts through a primeval forest.

2. They needled their way through a primeval forest.

3. It onward into the mystery of the primeval forest.

4. It'straggled onward into the mystery of the primeval forest.

5. The 000-hectare (3000-acre) Bialowieza Primeval Forest, which straddles the border between Poland and Belarus, is one of the largest unpopulated woodlands remaining in Europe.