Part of why Porto appeals to so many people is its gritty charm – the colorful azulejo tiles, the steep hills leading down to the Douro River, the historic wine cellars, and those old, winding streets that feel like they've

Part of why Lisbon appeals to so many people is its authenticity – the colorful azulejo tiles, the rattling yellow trams, the soulful fado music echoing through narrow alleys, and those epic views over the Tagus River. Oh, and don’t