Cat on the Wall, Tavira, Portugal

A feral tabby cat sits on the wall of the ruined castle in Tavira

Most of the castle was destroyed during the earthquakes of the 18th century. Only three towers and parts of the walls remain on the hilltop in the centre of the town.
 

A similar image with this tabby posing on the wall is available as a print from Fine Art America:

Sell Art Online