The Parthenon, a temple built entirely of Pentelic marble, in honor of the goddess Athena, protector of Athens, was the result of cooperation of major architects and sculptors in the mid-5th century BC. 

It is the greatest monument of the Athenian civilization and the epitome of Doric architecture. What makes it so great is not only the frieze, the sculptural decoration, colored pediments etc but also the fact that it was not created by a "genius" of the time, but the whole race suggesting the ultimate expression of a great civilization.

A place definitely to visit when you are in Athens!