Just in case: https://www.romereborn.org/
The actual brick and mortar museum (and model) does exist however: http://www.museociviltaromana.it/
http://www.museociviltaromana.it/it/collezioni/percorsi_per_...
Since the model was realized between 1933 and 1955 it may be somehow less accurate or missing some later discoveries/whatever, still it remains impressive, here is a short video that doesn't actually provide a sense of its size and detail: