National Archeological museum in Naples is absolutely amazing, but when I was looking for things to do in Naples it didn't show in the top attractions and we almost missed it. We made it there after an advice from our tour guide in Pompeii who insisted that we should stop there since a lot of artifacts are on display there. After seeing museum , I completely agree - it is a must. Museum is very complimentary to Pompeii trip. Well preserved statues, mosaics, coins, etc. from Pompeii and Herculean. There is something called "Secret cabinet". If you are reading this and you are curious - google it to get an idea.