National Archaeological Museum

The National Archaeological Museum houses the world's finest collection of ancient Greek artifacts, including the legendary Mask of Agamemnon and the mind-blowing Antikythera Mechanism, a 2,000-year-old astronomical computer that'll make you question everything you thought you knew about ancient technology. The Mycenaean gold collection glitters in the first rooms, while the bronze statues of Poseidon and the Jockey of Artemision are so perfectly preserved they look like they were cast yesterday. This isn't just looking at old stuff: it's watching 3,000 years of human achievement unfold room by room.

You'll start with the prehistoric collections and work chronologically through Greek civilization, but most people beeline straight to the gold and bronzes. The museum feels refreshingly uncrowded compared to the Acropolis, with actual space to contemplate each piece. The Antikythera Mechanism gets its own dramatic display case, and watching people's faces when they realize what they're looking at is half the fun. The building itself is classic 1890s neoclassical, all marble and natural light.

Entry costs €12 and you need minimum three hours to do it justice, though you could easily spend a full day. Most guides oversell the pottery collections: skip rooms 49-56 unless you're genuinely into ceramics. The garden café is overpriced but the courtyard is peaceful. Monday hours are shorter (1pm to 8pm), but afternoon visits mean smaller crowds and better light for photos.