Theres festivals. Theres mega-festivals. And then theres Roskilde. Started in the early seventies by a pair of high students, todays Roskilde is the largest festival in Northern Europe. Taking place over a staggering eight days and two weekends, the unstoppable juggurnaut has hosted upwards of 135,000 fans, more than 150 bands, and even boasts 32,000 volunteers. Roskilde proudly remains a non-profit donating millions Danish krona every year to various charities. Oh, and they also have a naked run so have fun in Denmark! More Info below.