For anyone with even a passing interest in port, the Solar do Vinho do Porto, the official bar of the Port Wine Institute, is an absolute must-do. The selection is staggering - over 400 different ports, ranging from dry white varieties to rare vintage wines - and the air is one of quiet, clubby sophistication, complete with cigars and comfy chairs and sofas arranged in groups around low tables. Prices start at 1.5€ for the simpler/less auspicious ports and climb steeply from there. The really amazing offerings start with the 40-year-old tawnys in the 10€ to 16€ range. Overall, the Solar do Vinho de Porto is an excellent choice for a drink before dinner at one the Bairro Alto’s many restaurants or an evening out with business colleagues, but be warned: the staff are as snooty as they are slow (although one is supposed to sip port), and they have no qualms at all about shooing you away if you arrive at a time when they have deemed the place to be too crowded.