Viana do Castelo region map by GoogleMaps engine. This allow: change of map scale; switch between scheme and satellite view; streets and houses search - in most of cities, towns, and some villages of the World. If you can't find something, try Yandex map of Viana do Castelo region or Viana do Castelo region map by OSM.
Drag the human icon from map left-top to the place you interest - to switch to virtual panorama streets view (exist on streets, marked blue during the drag)
Use toddler "+ -", or mouse weel over gmaps area, if you want to change map scale; for switch view to satellite photos - click "satellite" button on the map top-right.
See also capital of Viana do Castelo region: Viana do Castelo map