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This is a hidden gem in historical Porto which itself is a UNESCO world heritage site.
A restored historical house originally built in the 14th century as a customs house and mint.
Lots of exhibits, original structure still remaining. Explanations are very detailed. The most fascinating is a miniature model of the historical Porto region which will give the history (Portuguese, English, French, Spanish) of different spots when you pick them.
If you are, like me, a history (especially renaisssance), archaeological and architecture enthusiast, you will really enjoy this place. I spent over an hour and half but it can be done as a quick tour.
Right outside the Caïs da Ribeira. Perfect for a tour before or after a riverside lunch! Also good for a rainy day outing.
Free if you have the Porto card otherwise 4 euros.