The following is a selection of holocaust testimonies worth listening to. For further videos see videos from Yad Vashem on YouTube. The first two accounts are lengthy. The third is one of shorter interviews from Yad Vashem.
Eva Schloss (Stepsister of Anne Frank)
Rabbi Michael Mandel
After the introductory video by Rabbi David Bar Hayim (head of Machon Shilo), the first in a series of 16 videos of Rabbi Michael Mandel (his father) sharing his experiences before and during the holocaust, is presented. The entire series can be found here.