Greece is located in southeastern Europe on the Balkan Peninsula between the Ionian Sea to the west and the Aegean Sea to the east. Mountains cover most of mainland Greece, leaving narrow valleys and small plains between. The climate is mild year-round without extreme heat or cold. Greece is known for its ancient ruins like the Acropolis and Agora marketplace, as well as the origins of the Olympic Games and myths and legends from Greek mythology. It offers a pleasant climate, friendly people, and historical and cultural sites that make it a popular tourist destination.