Considering the Monte dos Avos in Tavira?
A VT member wrote the following comment about visiting Tavira:
The city bridge by dabuwan
The bridge over river Gilao is of roman origin and it has been reconstructed in the 17th century. You'll walk on it many times in Gilao to move from one part of the city to the other. Nice spot for people watching, as there are some benches to sit on.