what european countries are cheap to visit?
['Sofia, Bulgaria. Average daily cost on a budget: €22.35. ... ', 'Kraków, Poland. Average daily cost on a budget: €24.03. ... ', 'Bucharest, Romania. Average daily cost on a budget: €24.03. ... ', 'Belgrade, Serbia. ... ', 'Budapest, Hungary. ... ', 'Sarajevo, Bosnia-Herzegovina. ... ', 'Český Krumlov, Czech Republic. ... ', 'Warsaw, Poland.']