Porto, Portugal

Porto, Portugal second city, is the underrated alternative to Lisbon for solo travel — lower cost, smaller scale, and with a specific character (port wine cellars, azulejo tile facades, the Douro River canyon, the Livraria Lello bookshop) that has made it one of the fastest-growing tourism destinations in Europe. The solo traveler experience: Porto walkability is exceptional; the Ribeira waterfront neighborhood and the Foz beachside neighborhood each have distinct atmospheres; the wine caves in Vila Nova de Gaia across the river do free tastings and make for a social afternoon that reliably connects travelers. Cost: Porto runs approximately 15-20% cheaper than Lisbon for accommodation and food. The Francesinha sandwich — a Porto-specific dish of cured meats layered in bread and covered in a beer-and-tomato sauce — is both genuinely delicious and a reliable conversation starter.