Final answer:
The Acropolis is a fortified high area or citadel of an ancient Greek city, such as Athens. It contains several ancient buildings, including the iconic Parthenon.
Step-by-step explanation:
The fortified high area or citadel of an ancient Greek city is called the Acropolis. The Acropolis is an ancient citadel located on a high, rocky outcrop above and at the center of the city of Athens. It contains the remains of several ancient buildings, including the Parthenon, which is of great architectural and historical significance.