The Acropolis is located in Athens, Greece, high above the ancient city, although you can have trouble trying to find it...that is, if you are walking by foot. Out of all of the Plaka, Monstriki, and Syntagma squares, I saw maybe two signs leading me toward the site, but never more than that. Be prepared to hike around and ask the locals as to how to get there. One little clue is follow the brick road; it leads you there. But first you have to find the brick road!
Once you finally make your way to the site, make sure you have shoes with traction. Climbing up towards the main gate, you'll see the Theater of Dionysus. Here, they have smaller performances to show tourists some of the Greek culture. The area has much marble, stones, and stairs throughout the site. When you first approach, you'll be entering Athena's shrine. As you walk through, you'll notice there is much construction. They are in the process of restoring the monument.
Continue through Athena's Temple, and proceed to the Parthenon. Here you can envision the activities that took place thousands of years ago. It is still in relatively good condition, but it is thanks to the efforts of the reconstruction team. Don't be alarmed, as many artifacts are available there as well as in the museum on-site.
Besides taking in the ancient buildings, be sure to take a few moments to soak in the sights from above Athens. You can see the layout of the city as well as have a good view of Lycavittos Hill.
With your ticket into the Acropolis, you'll also receive tickets to see Ancient Agora and other historical sights/references throughout the city.