The FARC displaced roughly 50,000 people since peace talks began in 2012, according to a UN report. But the rebel group's role in driving overall violence in Colombia since 2012 isn't clear cut.
The historic opening between the two countries could have an impact on travel and business in the long-term, though changes are likely to happen gradually.
Cuba had relied on Venezuela to prop up its economy. But with that support uncertain, the Castro brothers appear to have decided to come in from the cold.
Former President Mujica, an ex-guerrilla who was once tortured in jail, agreed to take the prisoners earlier this year. He said he was doing it 'for humanity.'
Venezuela's President Nicolás Maduro's ratings hit an all time low in recent polls, and more than 85 percent of Venezuelans say the country is on the wrong track.
Brazilians now make up 2 percent of the foreign student population in the US, on par with students from Mexico and Japan.