4/15 Celebrity chef Ainsley Harriott goes back to Blackpool to recreate his holiday from 1974.
2/3 Barra Best ventures into the dark reaches of Ireland's longest railway tunnel.
36/52 Keith Wallace visits Iceland, where a tunnel is being dug into Langjokull glacier.
1/15 Dave Myers goes back to the Isle of Man to reminisce about his seaside holiday from 1967.
6/6 Clare walks the final leg of her journey with Colin Spearman, designer of the route.
BBC Radio 4
3/3 How the landscapes of America's five great deserts challenged the pioneers' westward push.
14/25 Michael Portillo discovers the Victorian coal heritage of Cardiff.
3/3 Simon travels along the Yangtze, discovering a revival of religious faith in China.
16/20 Michael helps to repair the ancient peat landscape of the Peak District.
13/25 Michael Portillo discovers Britain's hidden micro-mines within the Forest of Dean.
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