Cinque Terre, Italy

Cinque Terre's 2.5 million annual visitors cram into five villages connected by cliff trails, forcing a permit system that limits hikers to 15 per hour on the most popular path. Train reservations now require booking 72 hours ahead, a constraint 50% more restrictive than the Sagrada Familia's window. During summer, Monterosso's beach reaches 80% capacity by 10 a.m., with crowds outpacing the average Italian coastal town by 300%. Unlike Dubrovnik's cruise caps, Cinque Terre's trail permits reduce density by only 12%, leaving bottlenecks unchanged.