Five world-class links along Northern Ireland's short, glorious coastline. Royal County Down at Newcastle, beneath the Mountains of Mourne, has been rated the finest course on earth — Old Tom Morris by way of Harry Colt — and shares the summit of the island's game with Royal Portrush, the lone Irish host of The Open. Portstewart's Strand opens with one of the great front nines anywhere; Castlerock's Mussenden and the clifftop links at Ardglass — home to the world's oldest clubhouse, a castle dating to the 1400s — are hidden gems most countries would build a tour around. All five are private members' clubs that welcome visitors. A life-list pursuit on turf as storied as any in the game.