Yoko Ono met John Lennon in 1966 during a preview of Ono's art exhibition at a London gallery. The began an affair a year later and, after Cynthia Lennon filed for divorce, married in 1969 in Gibraltar. In addition to collaborating on numerous recordings, including Two Virgins and "Give Peace a Chance," the couple held "Bed-ins for Peace" to protest the Vietnam War. After the Beatles's breakup, they moved to New York, where their son, Sean Ono Lennon, was born in 1975. Lennon was shot and killed outside their apartment building on December 8, 1980. In his memory, Ono founded the Strawberry fields Memorial in Central Park, the John Lennon Museum in her hometown of Saitama, Japan, and the Imagine Peace Tower in Reykjavik, Iceland.