Prague

Prague's Old Town Square, anchored by the Astronomical Clock from 1410, draws 8 million tourists annually—outpacing #6 Santorini's 2 million by 400%. The city center, a UNESCO World Heritage site since 1992, contains over 2,000 Baroque, Renaissance, and Gothic buildings, making it one of Europe's best-preserved medieval cores. Its craft beer culture, with 50+ microbreweries, offers a vibrant local scene that rivals the imperial elegance of #7 Vienna. For travelers seeking architectural density and affordable luxury, Prague delivers more historic landmarks per square kilometer than any other capital on this list.