Subtitles section Play video Print subtitles Ambition... Conquest Lost... Murder... and the power of unrivaled technology. These are the cornerstones in the foundation of the Roman Empire. They were driven by a kind of collective cultural ego. Roman's colossal building projects: Stadiums... Palaces... Roads... Aquaducts... span 3 continents and unleash the power and promise of the world's most advanced civilizations. These structures became symbols of that idea of Rome. But while Romans dominated the landscape with their massive feats of construction, they were ultimately powerless to prevent their own self-destruction. March 15th, 44 BC. The most powerful man in the world lay lifeless on the floor of the Roman Senate. As a General he nearly doubled the size of the Roman Empire. As a Politician he engineered a stunning rise to power but now this battled-scarred warrior had been slayed in Rome and by Romans. His name was Gaius Julius Caesar. Caesar's rise to power was predicated on him wanting to have the best standing in the Roman State. He seemed to want too much power for himself. He didn't want to share power with others and this is what led directly to his assassination. Decades earlier as an ambitious young general, Caesar had recognized that the road to glory in Rome began on battlefields far from it. His thirst for military conquest would spawn construction of one of Rome's most intimidating feats of engineering. 55 BC Julius Caesar is leading 8 Roman legions. A total of 40,000 men north through Gaul. A Roman Providence encompassing modern France, Belgium and Switzerland. He wants to go to Germania, to Germany, and cross the Rhine because no Roman Commander has yet done so. He wants to be as great a conqueror as Alexander the Great. Go beyond what is known. The Rhine River lies on the edge of what is known. For centuries it has been a buffer protecting Germanic tribes from Roman expansion. No previous army could cross it with the might needed for conquest. But Caesar is unlike any previous warrior. He could have gone by boat but what is that for Julius Caesar to go by boat. A row boat? you know Are you going to put 8 legions on a row boat & go across? No, man! They need to march across. They need to be on horseback. From the engineering point of view, the difficulties of constructing a bridge over such a river are enormous in relationship to the depth of the water and the forceful current. If you bare in mind that this had to be done in a short period of time due to military needs. The works is actually truly exceptional. The bridge would need to be four football fields long and sustain 40,000 soldiers. Despite the Rhine's width, depth and strong currents, Julius Caeser is determined to succeed. To cross a river that size with a bridge is something which plays well with an audience back at home but of course it's something that plays extremely well with the audience standing on the other side of (across) the river who are going to be awestruck when they see this happening. With the speed and efficiency of a well oiled machine, Caesar's soldiers methodically transformed local timber into an expanding bridge. With every hour an engineering miracle inches closer to the Rhine's elusive northern bank. It's almost as if a spaceship, nowadays, the size, let's say, of half of Manhattan capable of some magnetic device that will lift buildings up in the air. That would be a pretty frightening thing. Something that we couldn't really grasp at all. The foundation of the bridge was a series of wooden piles driven into the bedrock of the river. Each pile was a foot and a half thick. Towards the middle of the bridge, they had to be up to 30 feet tall to reach from the surface to the bottom. By driven the piles in diagonally, Caesar's engineers had added extra stability to the bridge. When they drove the pilings in at an angle and connected them, in many ways they are doing what carpenters do when they are building a sawhorse. With the legs angled it utilizes forces to keep from being pushed over making it a stable work space. The sloping power offers a lot more strength against the force of the river and the flooding of the river but it's much more difficult to drive them into the riverbed than it is to drive a vertical pile. They would have had to work very carefully with wooden frames to push them into the riverbed. On the upstream side, the piles leaned in the direction of the current. 40 feet downstream the corresponding piles leaned against the current. Each set of piles were joined by a long connecting beam two feet thick. Lengths of timber were then laid against the beams and the surface was finished with tightly wrapped bundles of sticks. The design of the bridge was innovative but what made this engineering feat even more astounding is the speed in which it was built. Just 10 days after ordering it's construction Caesar marched across his bridge and toward his destiny. If we tried to do that today, we would never be able to build something like that in so few days with that kind of technology. We could match that feat today if we had thousands of loyal, sweating soldiers totally dedicated to Caesar and the objective of crossing the Rhine River to terrorize the Germans. Caesar had estimated the size of the Germanic forces at 430,000. More than 10 times the size of his army. When the Germans saw the Romans legions rolling over the Rhine, they quickly fled to higher ground. For the next 18 days, Caesar freely explored the territory north of the Rhine encountering no resistance. Then he crossed back over his bridge & dismantled it having made an unmistakeable point. It is symbolic of this that Rome can go anywhere. And to take it even further Julius Caesar can go anywhere. Caesar's bridge was an early indication of his single-minded ambition propelled him to unparallel power but would also prove to be his downfall. A decade later that ambition would When he was declared Rome's first dictator for life at the age of 55 in 44 BC whispers of assassination began to whisper through the halls of the Roman senate. He makes certain moves that suggest that he might want to be worshiped as a god that his ambition