Martha Kearney visits Whitstable to discover the fascinating and mysterious story behind Guy Maunsell’s sea forts at Shivering Sands. Built in the second world war as air defences, these towers can still be seen from the shoreline, although they are now in a state of disrepair. Martha discovers their incredible and strange history. Once home to up to 265 soldiers, these huge metal boxes on stilts later became the base for a broadcasting revolution. In the 1960s, pirate stations such as Radio City, Invicta and the short-lived Radio Sutch (run by the musician and parliamentary candidate Screamin ..read more

Martha Kearney is in Cambridge to explore wildlife at night. She takes an evening trip on a punt to see and hear the creatures which come out after the tourists have gone to home bed. She learns about the bats which at this time of year are just emerging from hibernation - hungry and on the hunt for insects. They swoop low over the waters of the Cam, their echo-location picked up and relayed for human ears by the clicking of a bat detector. A bat enthusiast from the Wildlife Trust tells Martha about bats' habits and identifies the species flitting through the trees around them. Punts have not ..read more

Martha Kearney explores the shifting sands of Gibraltar Point on the Lincolnshire coast, to witness the effects of beach erosion on both birds and people. At Gibraltar Point National Nature Reserve, wardens go to extraordinary lengths to protect shore-nesting birds from habitat loss caused by beach erosion. They build wooden platforms for the nests of little terns and cages to protect the nests of ringed plover, as well as mounting overnight patrols to keep predators away. In 2023 they tried the platform technique with oystercatchers for the first time, meticulously moving the nests in stages ..read more

Helen Mark is in Dorset to investigate the county's ancient sunken roads, known as holloways. They're deep, steep-sided tracks formed when soft rock erodes and are often overtopped by a canopy of trees. The erosion over centuries creates remarkable, often otherworldly spaces, that come with their own unique flora and fauna. On her trip to the Symondsbury estate near Bridport Helen hears about how the cave spider and goblin's gold moss can thrive in the cracks of these unlikely rockfaces. She is joined by Andy Jefferies and Rosie Cummings from Natural England who are behind a project to map Bri ..read more

Jude Piesse moved to Shrewsbury in Shropshire when her job changed, but it was only when she went for a walk alongside the river near her new house that she discovered she was living beside what had once been the garden where Charles Darwin spent his childhood. Much of the original 7 acres of the garden has been built on, but the original house, The Mount, still exists. It has been used as offices for many decades and has only recently been bought and is being renovated with a view to opening it up to the public with a museum and café. Whilst some local people know about the existence of the h ..read more

Martha Kearney hears stories of recovery from the Firth of Forth. First, she takes to the water with guide Maggie Sheddan and skipper John McCarter to explore the iconic Bass Rock, a volcanic island just beyond the shores of North Berwick in East Lothian. A decade ago, Bass Rock became the world’s largest colony of Northern gannets, home to over 75,000 breeding sites. Then, in 2022, Avian Flu hit the colony at the height of the breeding season. By 2023, the total population was estimated at just under 52,000 breeding sites, a decrease of over 30% from the count in 2014. But now, at the beginni ..read more

Up until the 1970s, postmen and women in rural areas walked their delivery rounds - taking routes through the hills dubbed "postal paths". Some routes, and fragments of others, still survive today. In this programme Helen Mark explores one of them, near the village of Shap in Cumbria, with author Alan Cleaver who is writing a book about these old paths. So far he's identified over thirty of them up and down the UK. Others have now been built over and are gone forever. Alan tells Helen about the cultural significance of the postal service in the past, recounting the poignant story of a man who ..read more

The Broomway has been dubbed the “deadliest footpath in Britain”, claiming more than a hundred lives. Helen Mark takes a cautious walk along this treacherous Essex seapath with Peter Carr and John Burroughs from the Foulness Island Heritage Centre. She’ll hear how people can easily become disoriented on the vast mud flats and tragically caught out by the rapidly advancing tides of the Thames Estuary. Helen will also be joined by Thea Behrman, the director of the Estuary Festival, to reflect on how this meeting point of land and sea can provide creative inspiration through its bleak beauty. Pre ..read more

Rose Ferraby joins geologist Dr Claire Cousins, visual artist Ilana Halperin and art historian Dr Catriona McAra as they explore the artistic and scientific terrains of both Orkney and the planet Mars. From the windswept Orcadian cliffs to the Martian landscape, they discover the surprising similarities of these two locations and explore how both science and art can interpret time, space and history in new and insightful ways. Produced by Ruth Sanderson ..read more

Over the centuries the River Quoile has carried Vikings, steam ships and cargoes of coal and timber from as far afield as the Baltic and Canada. Today it's a river for leisure pursuits – popular with canoeists, anglers and wildlife enthusiasts. Cadogan Enright is a councillor, environmental campaigner and chairman of the local canoe club. He takes Helen Mark out on the river to sing its praises, but also to point out concerns. He tells her that Downpatrick and the surrounding countryside were prone to tidal flooding in the past, but now the threat comes from the land - with increasing winter s ..read more