The digital revolution is often presented as a process of dematerialisation of experience and media. On the contrary, the notion of “matter” needs to be broadened to include digital entities. This is demonstrated by contemporary digital practices of memorialisation, which on the one hand innovate the concept of monument, but on the other confirm its status as social memory externalised on a support. In my lecture I will try to investigate this condition, exploring some relevant case-studies related to the two main technologies: virtual reality (immersive) and augmented reality (emersive).