The exhibitions will run through October 2017 and are free and open to the public.
South African journalist Robert Carmichael has covered Cambodia for many years and has just published a book looking at the effects of the Khmer Rouge regime on survivors.
The study of Khmer Rouge history is a politically sensitive topic in Cambodia, because some government officials have roots in the regime.
Prime Minister Hun Sen and other senior officials strongly oppose the prosecution of additional cases.
The May 4, 1970, shootings at Kent State University came after then President Richard Nixon ordered an invasion of Cambodia.
Hanoi rolls out red carpet for dozens of retired Western journalists now back in the country for 40-year reunion
Reporter Reasey Poch of VOA's Cambodian service tells On Assignment's Alex Villarreal about his emotional visit inside the home the Khmer Rouge forced his family to evacuate 40 years ago.
PM Hun Sen has refused to enforce police to cooperate in further prosecution or arrest of three former senior Khmer Rouge cadres charged with crimes against humanity.
The vigil was held at Wat Buddhikarama, a Cambodian Buddhist temple in Silver Spring, Maryland.
About fifty Cambodian-Americans in the Washington, DC area on Friday, April 17, 2015, held a candle vigil for those who died under the Khmer Rouge regime and to mark the 40th anniversary of the notorious takeover of Cambodia by the Khmer Rouge.
In an exclusive interview with VOA Khmer's Poch Reasey, Tea Lim Koun discusses his filmmaking in the 1960s and 1970s and what it meant to leave it behind.