Memory, history and memorial places constitute three crucial significations, which are illuminated in our western contemporary society. That is because of the traumatic past time, during the previous century. Collective memory is perceived as the sublimation of each and every personal memory that in total composes specific facts of distinct historical periods. Time, being conceived through the meanings of past, present and their interpretation could effectively affect the memory’s formation and recall. Not only is the memory signified by the time context, but also by the place, where memory traces could possibly be identified and transform the site by themselves. It is vital be investigated the relationship between memory and history so as to commemorate atrocities, understand the traumatic past and not repeat it. When it comes to history, it is analyzed as the science which explains the past and continues the real life. The social space hosts the previous relationship, creating the so - called memorial places, among them the museum is classified as a noble one. Particularly, memorial museum is not a historic building but a refuge of history, a compound of narrative environments and complete experiences. Narrations and personal worldliness are called so as to depict and activate memories. Surviving objects and personal testimonies are not simply installed in the museum space but they form it. Four fine memorial museums, Yad Vashem holocaust memorial museum in Jerusalem, being underground and concealing its existence, Holocaust memorial museum in Washington DC, trying to be incorporated in its surroundings, Jewish museum in Berlin, an irrational, dynamic, broken volume and Imperial war museum in Manchester, an extravagant combination of sharp, hollowed and curved surfaces, translate into museological forms the presence of absence and mourn the mass suffering. Matters of integration in the environment, morphology and typology, function, architectural technology, circulation, dark areas without natural light, claustrophobic displays and inclined floors are able to stimulate both the body and the mind and arouse emotions. The total experience renders the visitors as eyewitnesses, who are lead to an inner personal exploration so as to live the diverse forms of violence and the loss. At the forefront of public consciousness, memory, history, memorial places, architecture and their particular amalgamation exemplify a crucial current matter in our modern society.