You've read about the Greek ruins and seen plenty of pictures of it, but you've probably also witnessed massive crowds in the background of those images, too. While the Parthenon at the Acropolis might have a long wait and be buzzing with tourists no matter when you visit, it's still considered a must-see. Why? The sheer scale of the ruins is something one can only appreciate up close. Trust us, it's worth the climb, and visitors who have grit their teeth and overcome the tourist formalities have been very happy with their experience.