A combination picture shows a road near a prison at the U.S. Naval Base in Guantanamo Bay, Cuba, June 3, 2017 (L) and a boy walking along train rails in the outskirts of the city of Guantanamo, Cuba, December 6, 2017. REUTERS/Carlos Barria SEARCH "GUANTANAMO COMBO" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.