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Two gritty teams of hobbyist cavers attempt to break records for the longest and deepest caves in Canada.

In search of the country's largest ground beetle, Ray travels across Dartmoor's granite peaks and into its mysterious oak forests.

Starting near Cinque Terre National Park, this journey on a vintage train takes us along the spectacular Mediterranean coastline and into the Apennine Mountains.

This extraordinary journey travels back in time through a landscape forged by the Earth's forces and several ancient civilizations.

On an 11-hour journey through the North Island's volcanic landscapes, the Northern Explorer railway crosses historic viaducts and traverses the Raurimu Spiral, an engineering masterpiece.

A base jumper leaps from the Stawamus Chief with unfortunate results. A paraglider crashes in subzero conditions. New team members take the lead as five young men get lost in steep, snowy terrain.

The 200-mile La Ligne des Cevennes travels north from Nimes through a beautiful part of unspoilt France - rich in wildlife, famous walks and mining history.