<p>Hillwalking is one of Ireland's most popular leisure activities today. Rock climbing has developed to a level of technical excellence with crags in almost every county and numerous indoor climbing walls. Irish mountaineers have completed winter ascents in the Alps, scaled the highest Himalayan peaks and other previously unclimbed giants, and explored hitherto unknown valleys. Paddy O'Leary recounts the history of hillwalking and mountaineering...