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

Joanna arrives in Iran and explores the engineering marvel of Fin Garden, as well as breathtaking mosques and temples. In Yzad she discovers ingenious ways to keep cool in the heat.

The citizens of Antwerp are collectively making the city and its neighbourhoods more sustainable, more democratic and more livable.

Beginning in Leon and running through the Basque region, this mountain and coastal route in northern Spain is also a gastronomic tour exploring a range of local delicacies.

The economy of Canada's oil capital is diversifying - and so is its population. An increasing number of Calgarians want a livable city that favours sustainability.

Susan visits the spectacular Orkney Islands, where she sails past the tallest sea stack in the UK and visits an ancient Neolithic village.

Starting in Tirano in northern Italy, this rail journey climbs up through the Italian Alps to the roof of Europe - Zermatt, the gateway to the magnificent Matterhorn.

Decades of isolation left Berlin with deep-rooted urban and social scars. This, however, was the genesis of the city's fascinating urban development.

Susan visits the famous River Tweed and Gretna Green - the UK's wedding capital, with a history of spectacular weddings.

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.