There is one place which we couldnt take photos of but is a must visit - The Acropolis Museum. For someone who is interested in knowing the history of Athens, this place can easily take up half a day or more. Spread across 3 floors, the Acropolis Museum houses the ruins from Acropolis along with other artifacts from various excavations across Athens.
At 3pm I left to see Acropolis museum. It is very well organized museum. You can imagine the original glory as you walk along. However, if you can only visit 1 museum during your stay. I highly recommend visiting National Archaeological Museum instead. As it beholds most important artifacts from a variety of archaeological locations around Greece from prehistory to late antiquity.