The Romans were the most practical people of the Ancient Era, so marvels of engineering such as arches, roads and aqueducts seem typical of their technologies, which could be built faster and stronger by their invention of concrete. Yet the prosperity of the elite classes led their nervous emperors to also create huge entertainment arenas to keep the masses from noticing the misery of so many of their people. The result was pleasure places such as the Circus Maximus, the Baths of Caracalla, and the Colosseum, where death and corruption were displayed and enjoyed.