Waterfall inside Gaping Gill cave in Ingleborough, Yorkshire Dales National Park (England). This is the largest cavern in Britain, known as the Main Chamber- comparable to St. Paul Cathedral in London.
The Gaping Gill system is also one of Britain’s longest and most complex cave systems, representing one of the unmistakable landmarks on the southern slopes of Ingleborough - a 105 metres (344 ft) deep pothole with the stream Fell Beck flowing into it. Opened to the public few times a year, this cave represents without doubt an undiscovered beauty of the nature. .