The Colosseum in Rome is an ancient amphitheater built around 70-80 AD. It was used for various public spectacles, including gladiator contests, animal hunts, and mock sea battles. This iconic structure could hold up to 80,000 spectators and features a complex system of vaults and arches. Today, the Colosseum is a UNESCO World Heritage Site and one of the most popular tourist attractions in Italy. It stands as a symbol of the Roman Empire and its architectural ingenuity, showcasing the engineering skills of ancient Romans. Restoration efforts continue to preserve its historical significance.