Magazines can be a lot of things. Frivolous, fun, an escape from the world. But they can also be provocative and challenging, informative and a reminder that sometimes ideals need to be questioned and explored.
Whether taking a different angle on a highly politicised topic, uncovering a shocking truth, or presenting an image that makes us think twice, magazines can capture the zeitgeist in a way many other forms of publishing cannot. And to really make an impact and get people talking, debating and thinking an arresting front cover is a must.
From Rolling Stone's cover of the Boston bomber to Ellen Degeneres coming out on the front of Time magazine we take a look at some of the most hotly discussed covers of all time.