Final answer:
The Great Sphinx on the Giza Plateau is the monument with a man's head and a lion's body, representing Pharaoh Khafra and symbolizing royal power.
Step-by-step explanation:
The famous monument that has the head of a man and the body of a lion is the Great Sphinx located on the Giza Plateau in Egypt. The Sphinx is a mythical creature with the face thought to be that of Pharaoh Khafra. This iconic sculpture combines a human head with a lion's body and is the oldest and largest surviving sculpture from the ancient world. The body of the Sphinx was carved from bedrock and its head was made from natural limestone. This fusion of human and lion attributes symbolized royal power, with the lion being connected to the sun and the horizon, and greatly influenced Egyptian iconography throughout history.