Everybody loves an Irish pub. Whether you're settling in for a quiet pint by a roaring fire, embracing the craic with a raucous communal singalong or stumbling out of a questionable imitation on a holiday strip, we all gravitate towards these beacons of green, white and orange. But why do they mean so much to us?For the last decade, Colm Dalton has made it his life's mission to travel the globe in search of the world's best Irish pubs, in the hope of answering this age-old question...