Roman amphitheaters were large, circular or oval structures built by the ancient Romans for public spectacles, such as gladiatorial contests and animal hunts. The most famous example is the Colosseum in Rome, which could hold tens of thousands of spectators. These amphitheaters featured tiered seating, allowing audiences to view events from various heights, and were often constructed with stone and concrete. The design of Roman amphitheaters influenced many modern sports venues. They typically included an arena at the center, surrounded by seating areas, and often had elaborate entrances and exits for both spectators and performers. These structures played a significant role in Roman culture, showcasing the empire's engineering skills and providing entertainment for the masses.