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. 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.