The Colosseum is one of the world's most amazing wonders. Built nearly 2,000 years ago, the ancient amphitheater in Rome, Italy, is a window into Roman life during the rule of Emperor Vespasian. This elementary-level introduction, filled with vibrant photos and factual text, examines the structure and how it was constructed, from its arches to the battleground of gladiators. The building's significance in history and why it was built are also included. A Wonder Spotlight features the hypogeum (the underground tunnel system). Captions, on-page definitions, additional resources, and an index support young readers.