A page that quotes a metro fare or an opening time without being able to say where it came from is not worth trusting. This site takes each fact from the body that holds it: the transport operator for its own fares and timetables, the city for its own rules, heritage bodies for their own listings, and a museum or a cellar for its own hours and prices. Every page lists its sources at the foot, and every data sheet names the source of each row. Nothing here is guessed, and nothing is copied from another guide's guess.
Which body answers which question
Metro fares and zones come from Metro do Porto, and train services to Lisbon and up the Douro from Comboios de Portugal. City rules such as the tourist tax come from the Câmara Municipal do Porto. The historic centre's world heritage listing comes from the UNESCO World Heritage Centre, and regional travel facts from Visit Portugal, the national tourism board. Coordinates, population and area come from Wikidata, and road distances and drive times are routed over OpenStreetMap. When two sources disagree, both figures are given.
- Metro fares
- Metro do Porto · Fares, zones, the airport line
- Trains
- Comboios de Portugal · Lisbon, Douro and Braga services
- City rules
- Câmara Municipal do Porto · Tourist tax
- Heritage
- UNESCO World Heritage Centre · The listed historic centre
- Places and distances
- Wikidata and OpenStreetMap · Coordinates, population, drive times
- Prices, hours, rules
- The operator's own site · Never a reseller
Why some sites are never linked
An encyclopedia is used as a source of record for a measurement, a climate average or a date, and it is named where it is used, but it summarises other sources, so it is never the destination of a link. A reseller quoting a price it does not set is not evidence either: a price belongs to the operator that sets it. A short list of sites is excluded outright: review aggregators and ticket resellers that repeat other people's facts. Citing and linking are different acts here, as the editorial principles explain.
Common questions
Why is the encyclopedia not linked?
It is a source of record for a measurement or a date, not a destination worth sending a reader to, so it is named and never linked.
Where do tour and ticket prices come from?
From the operator's own site or the booking partner's current catalogue, with the date it was read.
What happens when two sources disagree?
Both figures are given, each with its source.