Denmark Norway London Helsinki Manila Sweden Thailand Estonia Scotland Korea Greenland China Rome Warsaw Spain Gibraltar Berlin Madeira   The Big 4 My girlfriend and I attented the first Big 4 concert ever, featuring Metallica, Slayer, Megadth and Antrax at the Sonisphere festival. They played for about a 100.000 happy spectators on June 16th, 2010. It was really a great day.