I went to Ostia Antica, an ancient Roman city (somewhat like Pompeii), which is 30 minutes out of Rome by train. It is quite amazing. There is a 4000 seat amplitheatre intact (check my gallery for the picture), and a full city to see, including old apartment buildings and cellars. You are allowed to walk inside (and in some cases, upstairs of) most of the ruins. It took me 3 hours to get through, although I did not go through every single part of it. I also saw the Pantheon, which is huge, and the Piazza Novana, which is currently the host of an American-style carnival (games, food, etc.). I should note that although the Roman subway cars look ugly from the outside, they are very clean on the inside. The buses are clean both inside
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