Ancient Roman structures are renowned for their impressive engineering and architectural innovation. Notable examples include the Colosseum, a grand amphitheater that hosted gladiatorial contests, and the Pantheon, famous for its massive dome and oculus. These structures not only served practical purposes but also symbolized the power and culture of the Roman Empire. The use of concrete and the development of the arch allowed Romans to build larger and more durable structures than ever before. Many of these ancient buildings, such as aqueducts and temples, have influenced modern architecture and continue to inspire awe today.