Passage: Jolie first witnessed the effects of a humanitarian crisis while filming Lara Croft: Tomb Raider (2001) in war-torn Cambodia, an experience she later credited with having brought her a greater understanding of the world. Upon her return home, Jolie contacted the United Nations High Commissioner for Refugees (UNHCR) for information on international trouble spots. To learn more about the conditions in these areas, she began visiting refugee camps around the world. In February 2001, she went on her first field visit, an 18-day mission to Sierra Leone and Tanzania; she later expressed her shock at what she had witnessed.In the following months, Jolie returned to Cambodia for two weeks and met with Afghan refugees in Pakistan, where she donated $1 million in response to an international UNHCR emergency appeal, the largest donation UNHCR had ever received from a private individual. She covered all costs related to her missions and shared the same rudimentary working and living conditions as UNHCR field staff on all of her visits. Jolie was named a UNHCR Goodwill Ambassador at UNHCR headquarters in Geneva on August 27, 2001.

Question: How did Angelina Jolie familiarize herself with conditions in war torn countries?
visiting refugee camps