Expect a very large, somewhat old-school museum packed with extraordinary Greek antiquities: Cycladic figurines, Mycenaean gold, the Antikythera mechanism, and room after room of superb classical sculpture. The building is grand but can feel overwhelming; lighting is uneven and English labels are decent but not exhaustive. Two to three hours is enough for most people unless you're deep into archaeology. Crowds are manageable compared with the Acropolis sites, but it still gets busy midday.
Best time to visit is spring or autumn; summer is hotter inside and the queues are longer. Expect to pay around €12-18 for a standard adult ticket, more like €20-30 if you add a decent audio guide or small-group tour. Skip-the-line options are worth it only on weekends or peak summer. Winter weekdays are cheapest and quietest.
Honest tips: prioritize the Mycenaean collection and the sculptural halls on the upper floor; the vase rooms are excellent but can be skipped if you're short on time or energy. Don't try to see everything. Pair it with the smaller Epigraphic or Numismatic museums nearby only if you have a full extra day; otherwise your brain will be fried.
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