Dubrovnik, Croatia

Dubrovnik’s medieval walls, immortalized by Game of Thrones, now endure up to 8,000 cruise passengers daily—a volume that is 50% higher than the safe capacity of the UNESCO Old Town. The city installed people-counters at gates and considered a 4,000-visitor cap after overcrowding caused a 25% increase in structural wear, outperforming #2 Ubud in overtourism severity. This Instagram pilgrimage has turned a historic gem into a photo studio, where fans of fictional queens outnumber those who know Croatian history.