Wookey Hole, Somerset, UK
Wookey Hole cave system has 25 chambers and was formed through erosion of the limestone hills by the River Axe. Before emerging at Wookey Hole the water enters underground streams and passes through other caves such as Swildon's Hole and St Cuthbert's Swallet. After resurging, the waters of the River Axe are used in a handmade paper mill, which began operations circa 1610, although a corn grinding mill operated there as early as 1086.
The caves, at a constant temperature of 11 °C (52 °F), have been used by humans for around 50,000 years. The low temperature means that the caves can be used for maturing Cheddar cheese.
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