Thanks to Frommer's Travel Guides for the image and great information about Portugal!

As we were on approach for our landing in Porto, we noticed that the city seemed to have a lot of bridges in close proximity.  Later, writing this, I did a quick search and found a Porto city tourism site that indeed refers to it as "Cidade das Pontes" (City of Bridges)".

I really enjoyed some the architecture we saw during our brief tour of the city, especially that of the airport:

I knew we would see lots of old cathedrals and historic buildings in Portugal, but it didn't occur to me that we'd see a lot of interesting modern architecture as well!