From the quirky to the awe-inspiring: Ireland's great X-Factor golf treats

All of Ireland's courses have a little X-factor, but which ones offer the most stunning treats?

GOLF'S X-FACTOR: Old Head's classic finishing hole from behind the green and looking out towards the famous lighthouse. Kevin Markham article

Ireland has close to 420 golf courses. Every one has a little X-factor in its DNA but some are of a superior breed. The obvious question is how do you identify ‘X-factor’? And who has it in bucketloads? Here are 20 X-factor categories… and some runners-up