Pause beneath the branching vaults as colour crosses the nave; outside, Plaça de Gaudí's pond frames the Nativity façade. Book an official timed ticket and carry ID. Wear clothing to at least mid-thigh, avoid transparent clothing, swimwear and bare feet, remove hats indoors, and leave tripods and suitcases behind. Towers require narrow stairs down, exclude children under six and visitors with reduced mobility, and require an adult for under-16s.