Raj Vinjamuri
Google
Get your tickets to the Monestary here!
If you have time, this is a decent museum to get a sample of Portugal's past. It helps you compare and contrast to other places, as there are Roman, Egyptian, and other artifacts in this small museum. If you are here for less than three days, you may choose other more notable museums/sights (like the amazing neighboring Monastery and Cathedral).
I wish there were clearer expectations of what is exhibited in the signage outside. The exhibits were nice, but not extensive nor expansive. The history of jewelery was my highlight.
If you have visited Rome or Cairo before, you will not be impressed. You will leave more knowledgeable on Portugal though!