BBC Earth

Stroll through a public park that was once a New York rail line and a church that was transformed into a thriving community hub.

Actor Ed Helms faces sheer cliffs, crumbling rock and a cringeworthy dinner menu while atop Colorado mountains; Helms discusses the road to his career in comedy.

Steve Backshall goes in search of one of Europe's most venomous snakes: the nose-horned viper. He also hopes to track down a bear and goes deep into a cave system to find a dragon.

Steve Backshall heads to Timor Leste in search of the biggest animal to have ever lived - the blue whale. He also hopes to find the saltwater crocodile, one of the giants of land.

Deep in the heart of Southeast Asia lies a region of rugged geography home to a diverse mix of people. A world apart from the rest of Myanmar, the Chin Hills are crossed by walking trails and paths.

President Barack Obama and Bear Grylls explore the Alaskan wilderness, where they observe evidence of climate change, sample wild salmon and catkins tea made with water from melting glaciers.

From space, we follow elephants struggling through drought, reveal unknown penguin colonies from the colour of their faeces, and discover strange ice rings that could endanger seals.

Nick starts with a helicopter ride along the northernmost stretch of the Mississippi.

Reza investigates the evidence of Persian leopards' existence in the mountains of Iraqi Kurdistan.

President Barack Obama and Bear Grylls explore the Alaskan wilderness, where they observe evidence of climate change, sample wild salmon and catkins tea made with water from melting glaciers.

From space, we follow elephants struggling through drought, reveal unknown penguin colonies from the colour of their faeces, and discover strange ice rings that could endanger seals.

Reza investigates the evidence of Persian leopards' existence in the mountains of Iraqi Kurdistan.

President Barack Obama and Bear Grylls explore the Alaskan wilderness, where they observe evidence of climate change, sample wild salmon and catkins tea made with water from melting glaciers.

From space, we follow elephants struggling through drought, reveal unknown penguin colonies from the colour of their faeces, and discover strange ice rings that could endanger seals.

Deep in the heart of Southeast Asia lies a region of rugged geography home to a diverse mix of people. A world apart from the rest of Myanmar, the Chin Hills are crossed by walking trails and paths.

Reza investigates the evidence of Persian leopards' existence in the mountains of Iraqi Kurdistan.

Robson and his uncle Matheson discover Hepple Estate in Northumberland and learn how to paint with pheasant feathers. They track wildlife before attempting to learn some circus skills.

The Rev Richard Coles joins Robson to explore the Northumberland coastline. They take a Canadian canoe trip along the River Coquet, and visit the hidden gem of Walkworth's secret hermitage.

Stroll through a public park that was once a New York rail line and a church that was transformed into a thriving community hub.