Article Photos: North Korea's caste system faces power of wealth

In this Monday, April 16, 2012 photo, students wave the national flags at an evening dancing party and performance at Kim Il Sung Square to commemorate late President Kim Il Sung's 100th birthday in Pyongyang, North Korea. (AP Photo/Ng Han Guan)

In this Monday, April 16, 2012 photo, students wave the national flags at an evening dancing party and performance at Kim Il Sung Square to commemorate late President Kim Il Sung's 100th birthday in Pyongyang, North Korea. (AP Photo/Ng Han Guan)