Appalling conditions inside Syrian refugee camp on Lesbos
Inside the Moria refugee camp, where thousands of refugees have escaped one nightmare at home only to be trapped in another.
The family of Kayla Mueller are giving $120,000 to the organization that they previously said failed their daughter.
Haunting video shows buildings in the Syrian city reduced to rubble by airstrikes and bombings.
ABC News' Serena Marshall is at the Doctors Without Borders Exhibit on the global refugee crisis in Washington, DC.
ABC News' Serena Marshall is at the Doctors Without Borders Exhibit with a look at the half dozen countries that are at the heart of the global refugee crisis.
Everyone, if you are receiving this, it means I am still detained. Reporter: The voice isn't Kayla's, but the words are, coming from the secret Isis prison where she was held in the Syrian desert. Please know that I am in a safe location, completely unharmed and healthy, put on weight in fact.
Those held with Kayla describe her caring, courage while in ISIS captivity.
Carl and Marsha Mueller's quiet life in Arizona is shattered when their daughter is kidnapped by terrorists.
Former hostages, Mueller's parents open up about the American aid worker who was captured by ISIS in 2013.
The humanitarian group's USA executive director Jason Cone says they decided not to negotiate for the American hostage's freedom.