Where do you find art? Locked indoors, in galleries? On plinths, fixed - unchanging - for centuries? Or what about outside, woven into the landscape itself? In a BBC Four documentary to be broadcast this Tuesday, Caius Fellow in art history Dr James Fox takes a journey through six different landscapes across Britain, meeting artists whose work explores our relationship to the natural world.

From Andy Goldsworthy's beautiful stone sculptures to James Turrell’s extraordinary sky spaces, the programme focuses on art made out of nature itself. Featuring spectacular images of landscape and art, the film sees James travel from the furthest reaches of the Scottish coast to the farmlands of Cumbria and woods of west Wales to explore a simple idea - how humans can transform nature into culture. On his journey, James explores six landscapes: the forest, the field, the path, the coast, the garden and the sky.

In a hidden corner of the forests of north Wales, James encounters Ash Dome, a living sculpture made by the artist David Nash. A circle of 22 ash trees that, since 1978, Nash has been coaxing to bend and meet at the top. This stunning artwork changes gradually over time, like the environment around it.

Out in the field James looks at the art of Andy Goldsworthy, an artist whose beautiful, and often fragile, sculptures build on the aesthetic impact of farming on the landscape.

From there James ventures to the coast, where he witnesses Julie Brook making an enormous flaming beacon in the middle of a sea loch in the outer Hebrides, a work that seems to encapsulate the dynamic force of the sea.

James then walks ten miles in a straight line across Exmoor (navigating ditches and fences as he goes) in an attempt to understand not only the paths we’ve made across the land but the art of Richard Long, an artist for whom walking is an artwork.

And onto the garden, where humans have tried to emulate and even improve nature and where he visits landscape architect Charles Jencks' extraordinary Garden Of Cosmic Speculation, a landscape whose patterns and shapes celebrate modern scientific ideas about complexity and chaos theory.

Finally James looks up to the sky through an artwork by the American artist James Turrell - which by framing the sky above reminds us of its simple beauty.

In each of these locations across Britain James looks at the way the marks that we have made on the landscape have, over time, inspired a very different way of thinking about both modern art and the world around us.

Our picture shows James admiring David Nash's Ash Dome in north Wales.

* Forest, Field and Sky: Art out of Nature will be broadcast on BBC Four on Tuesday, 3 May, 9-10pm. The programme can also be found on the BBC iPlayer after broadcast.