Pronounced “lyoo-BLYAH-nah” (we know you were wondering), Slovenia’s capital is an underrated gem. The scenery is reminiscent of Prague -- dramatic, sweeping bridges, and Baroque architecture -- but with a more laid-back vibe. There's also loads to do (and most of it on the cheap), including riverside cafés, museums (did somebody say Slovenian Railway Museum?!?!), and quirky underground bars like Pr'Skelet, which is full of skeletons. Also, the castle. Don't miss the medieval castle.