Athens was a powerful city in Classical times. It was known for the amount of learning that happened there. The city was home to Plato's Academy and Aristotle's Lyceum. The Parthenon, a temple dedicated to the goddess Athena, is the most famous of all its ancient monuments. It was built between 447 BC and 438 BC and its decoration continued until 431 BC. Athens had its own Constitution and it also created the world's first known democracy.