Ingleborough may not be the highest of Yorkshire's celebrated Three Peaks, but in many ways it is the jewel in the crown of the entire Yorkshire Dales National Park. Its many attractions include vast swathes of limestone pavement, unusual flora and fauna, astonishing glacial erratic boulders, and some of the finest caves in the UK. These include the Gaping Gill system, home to an enormous main chamber where the surface stream plunges underground down a 98-metre waterfall. You could spend a lifetime on Ingleborough and not see every nook and cranny, but this walk takes in some of the highlights of its southern flanks.