Back in 2014, I spent a week in Porto. I walked and walked, pretty much around the same familiar places.
The Torre dos Clérigos is one of the favorite spots for anyone who wants to see the city from the heights. The 240 steps you have to climb are worth the effort.
I took this photo to ask myself: "will I be able to get to the top?." It surely was motivational.

My entry for the Black and White Travel contest #28: