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Onassis Stegi

Make sure to get your tickets online a day before, it really saved me some time. The line was crazy at the entrance!

If you’re like me and love a good view, get to the rooftop bar around 6 PM. The sunset is stunning, and you won't regret it!
Don't skip the cafe on the ground floor. I found it quite reasonable, plus their coffee is awesome - perfect for a quick break!
Hellenic Cosmos

If you can, grab a ticket online before you go. It saves you time in line, and you might even find some discounts. I didn't, and it was a bit of a wait!

Don’t rush through the exhibits. Take your time to read about the history, it really enhances the experience. I kind of zoomed through and felt a bit lost after.
Adult Theaters

My advice is to arrive around 8 PM. The atmosphere is more lively then, and you might catch some cool performances that aren't on the earlier schedule.