A coliseum is a large stadium or arena built for sports competitions, entertainment, and public gatherings. The word is related to the most famous structure of this kind: the Colosseum in Rome, a massive stone amphitheater built nearly 2,000 years ago where Romans watched gladiator fights and other spectacles. That ancient structure could hold about 50,000 people and still stands today as one of history's most impressive buildings.

Modern coliseums are indoor or outdoor venues where people gather to watch basketball games, hockey matches, concerts, or other events. When a city builds a coliseum, it's creating a space where thousands of fans can come together. Los Angeles has the Memorial Coliseum, a historic stadium that's hosted two Olympic Games and countless football games since 1923.

Whether you're watching your favorite team play or attending a concert with 20,000 other fans, you're experiencing the same spirit that brought ancient Romans together in their great coliseum: the excitement of shared entertainment in a grand public space.