The Temple of Poseidon at Sounion was built during 444–440 BC, is one of the major monuments of the Golden Age of Athens. It is perched above the sea at a height of almost 60 meters. The Sounion Kouros, discovered in 1906 in a pit east of the temple alongside fragments of other statues, was probably one of a number of votive statues dedicated to Poseidon which probably stood in front of the god's sanctuary. The archaic temple was probably destroyed in 480 BC by Persian troops during Xerxes I's invasion of Greece. After they defeated Xerxes in the naval Battle of Salamis, the Athenians placed an entire captured enemy trireme (warship with three banks of oars) at Sounion as a trophy dedicated to Poseidon. The temple of Athena Sounias at Sounion was built in 470 BC, replacing an older building of the 6th century. Its architecture was unusual inasmuch as it had a colonnade on the southern and eastern, but not on the western or northern sides, a peculiarity mentioned by Vitruvius.