Right next to its more famous neighbor, Casa Batlló, you'll find a real gem that many visitors miss: Casa Amatller. Step inside this stunning modernist house, once home to a famous chocolatier, and you'll be transported back to the turn of the 20th century. The tour, which takes about an hour, guides you through rooms filled with original furniture and exquisite details, all beautifully preserved. It's a much more intimate experience than other nearby attractions, and you'll leave with a true sense of Barcelona's artistic soul—and maybe some delicious chocolate from the shop downstairs.