The primary leadership lesson from the fall of the Roman Empire would be to never hire mercenaries to protect your borders. The decline and fall of the Roman empire was a process that took several hundred years. With all deference to the opening sentence, it took a combination of factors that led to the fall of what is termed by many historians as the Western portion of the Roman empire. Certainly leadership was one of the many factors involved with the process, but to quantify it into a single sentence would be incorrect. As an aside, it took Gibbon in the late 1700's 6 full volumes to describe his version of the decline and fall of Rome.
Two prouductive resources found in the Ancient Roman Empire would be certain things such as wheat and grain.
Germany
Flavius Valerius Aurelius Constantinus Augustus was found Constantinople as the new capital of the roman empire. Constantine chooses Byzantium as the new capital of the Empire and renames it Constantinopolis.
The city state of ancient Rome. (In Italy, where modern Rome is also found).
Clay where in areas with clay soil. This type of spoil is very common is found in a great many areas. It was scattered over most of the empire.
Rome
Two prouductive resources found in the Ancient Roman Empire would be certain things such as wheat and grain.
Germany
It was more or less a continuation of greco/roman earlier amphitheaters found through out the empire
Flavius Valerius Aurelius Constantinus Augustus was found Constantinople as the new capital of the roman empire. Constantine chooses Byzantium as the new capital of the Empire and renames it Constantinopolis.
Charlemagne did not find an empire (find, meaning discover). He founded and empire (found, meaning begin building up). The empire he founded is called the Carolingian Empire. Depending on the historian whose works you read, the Carolingian Empire was either the beginning of the Holy Roman Empire, or ancestral to the Holy Roman Empire.
There were Roman baths all around the Roman empire. They were usually found in Forums of big cities, like the one in the city Rome.
the Romans built aqueducts all over the roman empire
Execution if found guilty by trial.
It found itself clashing with its ally Carthage in Sicily.
The Colosseum of the Roman Empire was where such actives were often found.
Those three continent would be Europe, Asia, and Africa.