O = Olympus
The ancient site of Olympus sits near the western coast of Greece. Cruise ships dock at Katakalon, a nice fishing village about 40 minutes from the site. While most ships do plan excursions to the site, it is also easy to take a taxi or a train to get to Olympus. Unlike many archaeological sites, this one feels like a park, with lots of trees, flowers and other vegetation. The day I went started out with rain, but once I got to Olympus, the clouds opened and it was a very nice, clear day.
The museum close to the site contains some of the statues found in Olympus, including an amazing statue of the Greek God, Hermes. This is also the museum where my friend left her camera (the story is part of the Excursions post).
Definitely worth a visit – you can even try running a race using the marble starting blocks!