The temple of Poseidon is one of the mainlands most beautiful ancient Greek structures. The temple was built by the ancient Greeks in honor of the god Poseidon, who is said to be the god of the sea. Near the Temple, there are freestanding statues of young men. The temple was built strategically by the ancient Greeks, at the very tip of the mainland and overlooking the sea. That's why this temple is so beautiful to visit, since you have a great view of the ocean and the horizon.