Sorry, we're closed

Did you know that all the museums and archaeological sites in Athens close at 3 pm? I imagined that we will have plenty of time to go and see the sights, but so far I have managed to see Acropolis from the roof terrace of our hotel, the National Archaeological Museum from the outside (contrary to the information in the tourist guide for February and March 2009 they are not open till 7.30 pm except on Mondays) and the temple of Zeus from behind a fence. The new Acropolis Museum (to be opened in March 2009) is not open to the public yet - but if it were, it certainly would be closed at 3 pm.