Dom Luís 1st Bridge - an arch bridge that spans the Douro River in Porto constructed by Teófilo Seyrig in 1881.
<a href="//commons.wikimedia.org/wiki/User:Basilissa" title="User:Basilissa">Małgorzata Kaczor</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>