The path to Halnaker Windmill in West Sussex is arguably one of the prettiest tree tunnels in the world - but it's not the easiest to find.

Hidden away in the depths of the South Downs National Park, this wonderful tree canopy looks spectacular no matter what time of year you visit: in spring and summer it creates a magical green netherworld; in October and November it erupts into fiery autumnal colours; and in winter the bare-branched arms look like a fine etching against the sky.

The trees, which grow along either side of a sunken track, include oak, field maple, hazel and black bryony.

To visit the tunnel you need to head to the sleepy hamlet of Halnaker, which is about 3.5 miles north of Chichester, on the A285. We recommend parking up near Warehead Farm, then head north-east up Mill Lane on foot. This public footpath follows the old London to Chichester Roman road, once known as Stane Street, and passes through the wonderful Halnaker Tunnel of Trees.

A path on the left will take you to the top of the hill where the Halnaker Windmill (pictured) sits in a commanding position overlooking the surrounding countryside. This four-storey windmill, built in 1750, has been restored and altered numerous times over the centuries. Today it is owned by West Sussex County Council.

Photographs: Mitotico/Shutterstock.com; Helen Hotson/Shutterstock.com

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