Lechuguilla Cave, in New Mexico, USA, is a deep cave, formed over four million years ago by the action of sulphuric acid from groundwater.

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Share price is up, and morale is climbing out of its deep, dark cave.

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These bacteria were collected from a deep and isolated cave.

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Professor Ron Clarke of Wits University in South Africa recently took CNN deep inside the Sterkfontein Cave at the Cradle of Humankind World Heritage Site to expose one more example.

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Five years ago, the Cairngorms Ranger Service launched the Cairngorm Poo Project following a boom in snow-holing, the digging of cave-like shelters into deep snow where walkers can spend a night or two on a hillside.

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These group activities satisfy deep cravings that developed during our early evolution in the cave.

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Local attractions include zip lines, cave and river tubing, scuba diving, jet skis and deep sea fishing.

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