Spain's family activity infrastructure is comprehensive across regions. The CosmoCaixa science museum in Barcelona — a rainforest greenhouse with live Amazon species, a geological wall of exposed stone layers, and a planetarium — is Europe's most visited paid science museum and one of the world's best for primary age children. The Segovia Alcázar castle — a fairy-tale turreted fortress above a river gorge, the model for Disney's Sleeping Beauty castle — is the most child-magnetic medieval building in Spain. The Aquarium in San Sebastián has an Atlantic tunnel walk-through and Cantabrian sea life exhibits at child height. The Feria de Abril and Las Fallas celebrations give families specific Spanish cultural events with built-in child engagement through colour, noise, and fireworks. The Madrid cable car over the Casa de Campo park is an accessible urban aerial experience for families.