Yes, Flour Mountain (Monte Farinha). Although it is only 947 meters high it offers a spectacular view and is known for being a very difficult part of the Portuguese long distance professional bicycle race (aka, Volta a Portugal em bicicleta). Why? Because of its very very steep way up.
Located in the district of Vila Real, Monte Farinha is also home to a sanctuary (like so many other hills and mountains in Portugal) that you can see here. Although it was built in the 18th century it doesn’t really fit in the architecture of the time – which is one of the reasons why I find it interesting.
The website: http://www.beyondlisbon.pt/