Once one of Europe's hidden gems, Prague now attracts millions of travelers annually – and for good reason. This beautiful city is home to impressive architectural landmarks, charming neighborhoods, friendly locals and a variety of lodging options. Spend time admiring the Old Town Square, the Prague Castle and the bizarrely designed Dancing House before sitting down for a meal and a locally brewed Pilsner. Even better, Prague is one of Europe's more affordable destinations to visit thanks to its many free attractions and budget-friendly accommodations. (GETTY IMAGES)