Sagrada Familia, Barcelona

Sagrada Familia sells 4.5 million tickets annually, yet 90% of visitors must book months ahead, a constraint stricter than the Taj Mahal's day-of entry. The unfinished basilica has hosted scaffolding since 1882, and current projections estimate completion by 2032. Peak-hour crowds approach 8,000 inside, creating a density 2.3 times higher than the average European cathedral. Unlike Dubrovnik's camera system, Barcelona uses timed slots capped at 500 per 15 minutes, but this still produces 30-minute waits. A 2022 survey found 62% of guests felt rushed through the nave, a metric 40% above the typical attraction.