1. **Colosseum**: The Colosseum is an iconic ancient amphitheater in Rome, Italy, built in 70-80 AD. It was used for gladiatorial contests, public spectacles, and other entertainment. The massive stone structure, capable of seating around 50,000 spectators, is a testament to Roman engineering and remains a symbol of the Roman Empire's grandeur.

2. **Roman Forum**: The Roman Forum was the center of public life in ancient Rome, serving as a marketplace, political hub, and social gathering place. It hosted important government buildings, temples, and monuments. Today, its ruins reflect the heart of ancient Roman civilization, offering insight into Rome's rich history.

3. **Palatine Hill**: Palatine Hill is one of the Seven Hills of Rome and is considered the birthplace of the city. According to legend, it was where Romulus founded Rome in 753 BC. The hill later became an elite residential area, housing emperors and aristocrats, and features impressive ruins of palaces, temples, and gardens.