Where would one go to witness gladiatorial combats?

The Coliseum, also known as the Flavian Amphitheatre, is the iconic structure in Rome associated with gladiatorial combats. Built during the reign of the Flavian emperors, it could hold tens of thousands of spectators who gathered to watch a variety of public spectacles, including gladiatorial games. This amphitheater was specifically designed for such events, featuring a complex system of underground passages and holding areas for combatants and animals.

While the other locations mentioned, such as the Amphitheater (a more general term that can refer to various similar venues), Circo Massimo (which was primarily used for chariot races), and Forum Romanum (the public center of ancient Rome for political and social activities), were important in their own right, they did not serve the primary purpose of hosting gladiatorial contests like the Coliseum did. The Coliseum remains the most famous site for viewing these brutal and dramatic competitions, making it the correct answer to the question.