In 1968, a civil rights protest spiraled into violence in Northern Ireland, sparking a conflict between Catholics and Protestants known as "the Troubles." The fight between religious factions lasted three decades and killed an estimated 3,500 people. In 1998, they signed a peace pact called the Good Friday Agreement, which brought an end to the bloodshed. But 20 years later, tensions still persist. Across the region, pockets of Catholic and Protestant neighborhoods remain culturally and physically separated even as many work to bridge the gap. NewsHour Weekend Special Correspondent Kira Kay reports.