The foundation also tours internationally, holding anti-nuclear displays in cities around the world. The 2005 exhibition was held at the Peace Museum in Chicago, coinciding with the 60th anniversary of the bombing as well as a conference in New York which reviewed the Nuclear Non-Proliferation Treaty.[4] In 2007, the exhibition was held in Guernica, Spain, which was heavily bombed by the Luftwaffe in April 1937.[5]