I love Port, and among the best trips I ever took was to Porto a few years ago. I visited the Taylor Fladgate facility in the city, then visited the vineyards about a three-hour drive outside at stunning location on the steep walls of the Douro River valley. The experience and hospitality were great.

In addition to the older or vintage ports, like number_6 mentions, the Taylor 20-year tawny is my favorite everyday port. (They serve it on Qatar Airways, which is always a treat.)