Photo: GetYourGuideFounded in 1750, Burmester is one of the oldest port houses, and its cellars in Gaia offer a relaxed, well-run tour that ends with a guided tasting of its white, ruby and tawny ports. The guides know their history and the groups stay small. Choose the pairing option if you want chocolate or cheese alongside. Ask about the vintage bottlings, and take the short walk down to the riverfront afterwards for the bridge views.