Casa Batlló in Barcelona, Spain, is a masterpiece of modernist architecture, featuring captivating courtyard mosaic garden walls. The intricate mosaic patterns found here are the work of renowned architect Antoni Gaudí. The courtyard walls are adorned with colorful mosaic tiles, organic shapes, and whimsical designs, creating a surreal and enchanting atmosphere. Visitors can admire the unique mosaic work, explore the courtyard, and appreciate Gaudí's innovative approach to design and craftsmanship.