Trajan’s Market (Mercati di Traiano) is perhaps the most interesting areas of Rome's five Imperial Forums, built by Julius Caesar and his successors at the very zenith of the Imperial Age. This vast, multi-level semicircle was old Rome's version of the modern-day shopping center, and it remains an astoundingly intact illustration of Roman metropolitan planning. It is considered to be Rome's first "shopping focus". The intricate, made of red block and cement, had six levels in which there was once up to 150 different shops and apartments.