Decay, age and neglect are threatening some of Havana's most historic buildings. Experts say a partial or total building collapse occurs twice every three days. Some buildings were restored in Old Havana after the United Nations designated it as a cultural site, but financing does not exist for repairs in other neighborhoods, officials say. "These jewels are disappearing," said Nicolas Quintana, a professor of architecture at Florida International University. "Time is the biggest enemy."
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