I am a history fanatic, so I thought the Parthenon was great. It is a full-size replica of the Parthenon on the Acropolis in Athens, Greece. I've seen the Elgin marbles in the British museum in London. This was much better because you can see what the Parthenon actually looked like in ancient times.
The most amazing part is the 42-foot-high sculpture of Athena, the goddess of wisdom. The statue is still not complete. It is mainly white now, but the guide told me they intend to gild it this fall. I can't imagine how spectacular it will look completely gold. Another fascinating part was all the snakes that were part of the statue (I think there were 13). They all symbolize something, so it is fun to try to count them all. I am a teacher so I bought some post cards and some slides so that I can use with my class. Being able to actually see it will make studying about ancient Greece so much more exciting for my students.
If you have a child who is or will be studying about Ancient Greece, I would recommend visiting the Parthenon. The whole visit took us only 30-45 minutes and was time well spent.