Acropolis - a  Citadel on a highpoint in the city.
Acropolis at Corinth 
Site of a temple of Aphrodite
Acropolis Gr.,=high point of the city

Fortification on the top of a hill.

Acropolis at Athens
 
Fortified site of the Parthenon and several temples to the city goddess, Athena, as well as a temple to Poseidon.