Prague

Prague's Old Town Square, anchored by the Astronomical Clock from 1410, draws 8 million tourists annually—outpacing 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 Vienna. For travelers seeking architectural density and affordable luxury, Prague delivers more historic landmarks per square kilometer than any other capital on this list.