A beauty spot of the South Pennines with more than 160 hectares (400 acres) of unspoilt woodland.
As well as being the home of the northern hairy wood ant, there are tumbling streams, glorious waterfalls and stacks of millstone grit, all crisscrossed by more than 15 miles (24km) of footpaths.
At its heart is Gibson Mill, a family-oriented visitor centre, telling the history of the valley over the past 200 years, with interactive displays, dressing up, dancing and exhibitions. Having no link to the national grid, the mill is unique in the UK and is the Trust's flagship sustainable building.
Guided Walk: High Brown Knoll, 26th October 2019, 11:00 to 15:00
An opportunity to catch the late Autumn colours as we climb through the majestic beeches of Pecket Well Clough onto wild moorland of High Brown Knoll. Then to Lumb falls and returning down the delightful Crimsworth Valley.
A New Leaf - a woodland walk with storytelling and song, by Brian Acton, 29th October 2019, 12:30 to 14:00
One day, a mysterious and beautiful new leaf arrives,
but the leaf is not all it appears to be!
Wild Wednesday's - Help the Rangers, 30th October 2019, 12:00 to 15:00
The outdoor team at Hardcastle Crags invite you to roll up your sleeves, become rangers for an afternoon and help us give nature a helping hand.
Mini broomstick making - Wild art - 50 Things to do before you're 11 3/4, 31st October 2019, 12:00 to 15:00
Using the natural resources from the woodland, come along and create your very own mini broomstick.
Christmas cook on a campfire - 50 things to do before you're 11 Â¾, 14th December 2019, 12:00 to 14:00
Join us for a seasonal take on this popular activity with a trail through the woods, hot chocolate and a few surprises along the way.