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Sonisphere doesn't just take place in the UK - it's a touring music festival that travels through much of Europe before gracing Knebworth House with its hard rock line-up.
Over the years, the festival has hosted Rammstein, Slipknot and Biffy Clyro. In 2012 however, the festival was cancelled last minute, and didn't return in 2013.
This year it's back, and as big as ever. So far Metallica, Iron Maiden and The Prodigy are among the line-up. It's probably not one for the whole family to enjoy, but it's a firm favourite with hard rock fans.
Acts to have played legendary events at Knebworth over the last 40 years include Oasis, The Red Hot Chili Peppers, The Who, Deep Purple, Genesis and many more. Sonisphere began at Knebworth in 2009 and saw acts such as Metallica, Iron Maiden, Linkin Park and Slipknot perform.
Tickets to Sonisphere 2014 are on sale now. For more information visit Gigwise gig tickets.
