The bell tower of the Westerkerk is famously topped by the blue imperial crown that Habsburg emperor Maximilian I bestowed on the city for its coat of arms in 1489. The climb up the stairs of the 85m tower can be strenuous and claustrophobic, but the guide takes breaks on the landings while describing the bells, and the panoramic views are worth it. Tours depart every half hour. Children under six aren't permitted.