It lasts eight days, boasts a sold out crowd of 130,000 Danish, and is the craziest festival in Scandinavia. Welcome to Roskilde, where acts like The xx, Foo Fighters, Arcade Fire, Lorde, and The Weeknd, competed with the campground antics of the festies. International festival photographer, Matias Altbach, checked in from the action and came back with a bunch of photos below. See more of his fest photos from around the world at Matias Altbach Photography and his Instagram account.