3Casa Batlló, Barcelona

Another of Gaudí’s masterpieces, Casa Batlló is a whimsical, dreamlike building on Barcelona’s Passeig de Gràcia. Its undulating facade, colorful mosaics, and dragon-inspired roofline make it one of the most recognizable houses in the world.

Inside, Gaudí’s organic design continues with flowing staircases, wave-like walls, and light-filled interiors. Visiting Casa Batlló feels like walking into a living piece of surrealist art. It’s playful, poetic, and utterly unforgettable.