A City does not only exist with its physical feature but also with its intangible thing within it, including the people’s memory. Our memory, either it is delightful or unpleasant, plays a role in molding our perception about our environment. Meanwhile, we also tend to build something—to construct our environment—for commemorating significant events. Regarding this phenomenon, this paper aimed to understand how a tragic event affects urban space by examining conceptions of “tragedy” and “absential feature” and their relation to space of commemoration. As a reflection of the conceptual inquiry, this paper analyzed how Semanggi Tragedy, which had happened on 1998-1999, affected Jakarta’s urban space. The study showed that the tragedy brought ‘absence’ that urges people to create a tangible feature to response their grief, loss, and hopes. Semanggi’s physical development—as a way to move on—only emphasizes the ‘absence’ of the tragedy and does not stop people not to forget it.