Lisbon: Aguas Livres Aqueduct

I always think of aqueducts as typically Roman, having grown up near one of those, but this one is 18th century.

Of course, I had to go for a walk along it. Unfortunately, it's locked at the far end, so I couldn't get into the woods on that side. It's good for a view of Lisbon though.

Infrastructure is a marvelous thing.