Greece's Mount Athos is a mountain located in northern Greece, and is the highest peak of the entire country at 2, 033 meters. It is an important part of Greek culture and is home to 20 monasteries and thousands of monks. Greece's Mount Ossa is located in Thessaly, and is the second highest peak in the country at 1, 978 meters. It is a popular destination for hikers and climbers, and is known for its stunning views of the surrounding landscape.