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

The Cambrian Line is the UK's hidden secret - a rail line of spectacular views steeped in history and nostalgia, including quaint villages, famous castles and the highest mountain in Wales.

Urban designer Mikael Colville-Andersen explores Los Angeles, whose diverse neighbourhoods are certainly its greatest asset. But overcoming the many underlying inequities is no easy task.

The Rocky Mountaineer train travels through some of North America's most staggering beauty on a journey from Vancouver to Banff in the heart of the Rockies.

In Madagascar, Joanna discovers the secrets of the world's second most expensive spice, vanilla - from the unique way it's grown to how it's dealt on the streets.

Susan continues to Scotland's historical heartland - Stirling. Here she learns about Scotland's other national sport, curling.

Rolling through the magical beauty of Norway, this train journey takes us from Oslo to Bodo, a small city inside the Arctic Circle, with tales of trolls, reindeer and Vikings along the way.

Joanna follows the legendary spice trail to her birthplace, India, in search of a kitchen cupboard staple once known as "black gold."

Joanna heads to the remote Indonesian island of Banda, once the only place on Earth where nutmeg grew, discovering both its charms and its dark past.

Dan travels the historic road of Ermin Way, which links the two Roman towns of Calleva Atrebatum and Glevum - now known as Silchester and Gloucester.