CASTLEROCK GOLF CLUB: One of the most natural links courses you will ever play. Founded in 1901, originally as a nine-hole layout. The famous Scottish club maker, Ben Sayers, extended the course to 18 holes in 1908. In 1925, Harry Colt made further modifications. The Championship Mussenden Course is a par 73 with five par-5's, four par-3's, and nine par-4's. The best-known hole is the fourth, called the Leg o'Mutton, a 200 yard par-3 with a railway line to the right, a burn to the left and a raised green.