Ancient Greece lasted from around 800 BC to 600 AD and included the Classical period from the 5th to 4th centuries BC. Greece has a mountainous landscape and was located in Southern Europe, almost entirely surrounded by the Mediterranean Sea. Society was divided into upper, middle, and lower classes with slaves at the bottom. The economy used coins and trade, and Greeks developed architecture like temples, art, and inventions like maps. Religion, festivals, and athletics were important parts of Greek culture.