In 400 BC Rome was still a small city. It probably did not even have a stone wall to protect the city.
Map legend
Temple of Juno Moneta
Curia Hostilia
Temple of Concordia
Comitium
Temple of Apollo
Temple of Bellona
Temple of Jupiter Optimus Maximus
Temple of Juventis
Temple of Saturnus
Old shops
Forum
New shops
Temple of Tellus
Sister's beam
Forum Halitorium (vegetable market)
Temple of Carmenta
Temple of Opis
Temple of Fides
Temple of Castor & Pollux
Temple of Regia
Temple of Vesta
House of the Vestal virgins
House of the Tarquinii
Temple of Mater Matuta
Temple of Fortuna
Tarpeian rock
Temple of Aesculapius
Temple of Victoria
Temple of Jupiter Stator
Temple of Portunus
Forum Boarium (cattle market)
Romulus' hut
Cacus' cave
Temple of Hercules
Grain exchange
Pons Sublicius (bridge)
Great altar
Temple of Liber & Libera
Porta Trigemina (gate)
Temple of Ceres
Temple of Mercurius
Circus Maximus
The Forum lies between the two
hills Capitolinus and Palatinus. This
was a swamp and had to be drained. For this reason the great sewer
Cloaca maxima was constructed.
Romulus' hut at the Palatinus was kept there, even in the times of
Augustus, though Romulus and his hut were mythical.
The same is true for the sister's beam. Both object must have been
placed in later times.
The Romans went through a lot of trouble just to "prove" their myths.