The worldwide community of museums celebrated International Museum Day 2017 around the theme “Museums and contested histories: saying the unspeakable in museums”. This theme focuses on the role of museums that, by working to benefit society, become hubs for promoting peaceful relationships between people. The acceptance of a contested history is the first step in envisioning a shared future under the banner of reconciliation. Saying the unspeakable in museums looks at how to understand the incomprehensible aspects of the contested histories inherent to the human race. It also encourages museums to play an active role in peacefully addressing traumatic histories through mediation and multiple points of view.