The Digital Atlas of the Roman Empire lets you explore ancient Rome in a Google Maps interface. (via @pbump)
Update: From Vox, 40 Maps That Explain the Roman Empire.
Two thousand years ago, on August 19, 14 AD, Caesar Augustus died. He was Rome's first emperor, having won a civil war more than 40 years earlier that transformed the dysfunctional Roman Republic into an empire. Under Augustus and his successors, the empire experienced 200 years of relative peace and prosperity. Here are 40 maps that explain the Roman Empire -- its rise and fall, its culture and economy, and how it laid the foundations of the modern world.
In Jospeh Tainter's The Collapse of Complex Societies, the author argues that the fall of Rome happened because "the usual method of dealing with social problems by increasing the complexity of society [became] too costly or beyond the ability of that society". Basically when Rome stopped expanding its territory, the fallback was relying solely on agriculture, a relatively low-margin affair.
The distances, now no longer adjacent to easily accessible coastline, were making the cost of conquest prohibitive. More to the point, the enemies Rome faced as it grew larger were vast empires themselves and were more than capable of defeating the Roman legions.
It was at this point that Rome had reached a turning point: no longer would conquest be a significant source of revenue for the empire, for the cost of further expansion yielded no benefits greater than incurred costs. Conjointly, garrisoning its extensive border with its professional army was becoming more burdensome, and more and more Rome came to rely on mercenary troops from Iberia and Germania.
The result of these factors meant that the Roman Empire began to experience severe fiscal problems as it tried to maintain a level of social complexity that was beyond the marginal yields of it's agricultural surplus and had been dependent upon continuous territorial expansion and conquest.
Hopefully I don't have to draw you a picture of how this relates to large bureaucratic companies.
David Galbraith graphs the population of Rome from 300 BC to the present.
The population [of Rome] during the Renaissance was miniscule (yet it was still a global center), when Michelangelo was painting the Sistine Chapel it was considerably smaller than a town like Palo Alto is today (60K); Rome at its nadir was about the size of Google (20K employees); the growth of Rome during the Industrial era is much greater than the rise of Ancient Rome.
David, you should check out The Inheritance of Rome; I'm about 100 pages in and pretty interesting so far. Also, it would be instructive to do the same graph but Rome's population as a percentage of world population.