(CNN) -- It's an itch he just hasn't been able to scratch. More than 54 years after he announced the success of Fidel Castro in the Cuban revolution, Larry King still hasn't been able to interview him. 

"The day Castro marched into Havana, I was on the air in Miami doing my morning show and I made the announcement," King told Ismael Cala in an interview for the "Cala" talk show on CNN en Español. 

Just two years ago, King was in Cuba to try to get that elusive Castro interview, but the Cuban leader remains the only major figure he hasn't interviewed, he said. 

"Forget politics, he has run a country for 50 years, he's a successful revolutionary, an intriguing person," said King about why he remains fascinated. 

One top interview he did secure -- with the late Venezuelan President Hugo Chavez in 2009 -- came back into focus recently with Chavez's death. 

"What's funny is that he spoke perfect English off air, but once the interview started, we had an interpreter," King said. "He wanted to talk in his native language." 

King -- the last person to interview Chavez on CNN -- recalls Chavez being easy to be around and engaging, even remembering him as a hugger and singer. 

"He was a conflicted person. An enigma. Yes, he was against capitalism, but he helped a lot of people, especially in the Northeast (of the U.S.). When there was a shortage of oil, he gave a lot of free oil to that area." 
Where did he help a lot of people, specifically?
 Northeast (of the U.S.)