He’s tearing down fences. Obama and his family have arrived in Havana to put decades of neighborly tension to rest. They will visit Old Havana and historical sites ahead of Tuesday’s meeting between Obama and President Raúl Castro. Discussions about greater cooperation in fields like agriculture and health care are on the agenda in a bid to cement the warmer relations. The U.S. commander in chief will also deliver a speech from the capital’s Grand Theater to publicly embrace this new era of opportunity for both nations.