Douro River Lighthouse was designed to help vessels navigate through dangerous waters. Still a striking feature of the landscape today, it's bound to have a few stories to tell about sailing triumphs and rescues.
Douro River Lighthouse charges entrance, so bring some money and head to the large district of Aldoar Foz do Douro e Nevogilde. Where to next after the longstanding beacon? Sandeman Cellars, Casa da Musica and Porto Cathedral are nearby sights worth checking out if you have time up your sleeve.