Fodor's Expert Review Museu do Teatro Romano
This small museum close to the cathedral displays some of the few visible traces of Roman Lisbon. The space was once a Roman amphitheater with capacity for 5,000 spectators, and was built by Emperor Augustus in the 1st century BC. It fell into disrepair during the Middle Ages, and lay buried and forgotten until reconstruction of the area began in the 18th century. Columns and other interesting artifacts are on display here, and multilingual touch-screen videos outline the history of the amphitheater and Lisbon's Roman history.