The tiles that pave the many pedestrian streets and most sidewalks in Portugal, at least in Lisbon and Lagos, are called calçada and are one of the things that have made this country unique to me. They can be quite slippery, and apparently a nightmare in a rainstorm, with rivers of water gushing down them. Consequently, they have ripped up many streets of them and paved them to make them more car accessible, but they have preserved enough of them to make Portugal unique in this way.
My Corner of the Village 