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.[90] Upon her return home, she contacted the United Nations High Commissioner for Refugees (UNHCR) for information on international trouble spots.[89] 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