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

Ray visits Galloway, exploring the riches of the stunning coast of southwest Scotland and the hidden treasures that live in Britain's largest forest park - including the rare and elusive pine marten.

London is full of remarkable stories, from the Victorian gas lamp that helped save the city's sewage problem to the surprising history behind Marble Arch.

Ray explores the wildlife surviving against all odds in the rugged landscapes around Britain's highest mountain range, Snowdonia.

Michael takes us to spectacular Sevilla and the ancient town where he lives part of the year - Carmona, where he throws a homecoming party at the historic house he renovated.

San Francisco is America's ultimate boomtown, whose secret stories include a pair of giant Dutch windmills and an unassuming apartment block that was the location for a top-secret CIA experiment.

Milan is the most multicultural city in all of Italy due to years of open-mindedness and open doors to immigration.

The most francophone city in North America, Montreal is a place of cobblestones and creativity that's often described as a peculiar mix of Paris and Brooklyn.

Starting in Kyle of Lochalsh, a tiny fishing village on the west coast of Scotland, this rail journey travels across the Highlands through the whisky country of Speyside to Aberdeen.

Ray journeys by canoe along the mighty River Thames from Oxfordshire to London, before setting up camp in one of the world's most precious and exclusive woodlands.

Michael ventures to the wild Atlantic coast to explore Europe's oldest inhabited city, Cadiz, before heading inland to Jerez, the world capital of sherry.

Local experts search out some of New York's most remarkable hidden stories, from a 1916 terror attack's impact on Lady Liberty to a secret in the basement of the famous 21 Club.

Board the Denali Star, a luxury passenger train, in Anchorage for a journey that heads north along the Knick Arm and into the vast wilderness of Alaska.

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

Monty Don journeys from the Atlantic to the Mediterranean coast, taking in the "Galician Versailles," a popular wildlife sanctuary and spectacular home gardens.

Michael stops at the town of Isla Cristina, home to the busiest fishing port in Andalucia, visits stunning underground caves and discovers the secrets of the region's famous aged ham.

Despite the challenges of rapid urbanization and a complex geo-political backdrop, the people of Istanbul are striving to make their city more just, peaceful and liveable.

Explore a little-known but beautiful route through Sweden on the Inlandsbanan, a unique private train that travels from the lakes around Mora and Ostersund to the Arctic Circle.