The Acropolis of Athens, Greece - Roman Agora Ruins.

On Greece's National Day, Opi Day All site museums are free Take advantage of this great day to visit everything in one day. The sites open at 8 AM, and there are hardly any lines before 9 AM. By 10 AM, it gets extremely crowded. Please be aware of this. I entered at 8:50 AM and only waited for 3 minutes. When I left at 10:30 AM, the line stretched two blocks away. Right after the Acropolis is the Roman Agora, where many people queue up for the museum. You can also come back later if it's too crowded. Even in good weather, the sunlight on the hill is intense, so remember to wear sunglasses and apply sunscreen. It's a very worthwhile place to visit, but the rocky terrain is difficult to walk on, so wear sturdy shoes. There are a lot of people, but as the cradle of civilization, it is highly recommended to visit.