The best tiling we saw in Porto was at São Bento Railway Station (Estação de São Bento.)

I neglected to take a photo of the exterior. This one is from TripAdvisor:-

No tiles there obviously. But the vestibule was fantastic – not to mention packed with people whom it was impossible to avoid getting in the pictures except when only photographing the upper portions:-

The frieze at the top showed agricuktural scenes:-

I had to stitch two photos of the corniced ceiling to get most of it in. The words Minho and Douro refer to the province in which Porto is situated (between the Minho and dDouro rivers):-

This brilliant interior reminded me of Groningen Railway Station.