BARCELONA SPAIN TOURISM - AP 10-14-19 1.jpeg

This Oct. 14, 2019 photo shows the inside of Palau de la Música Catalana, built by famed architect Lluís Domènech I Montaner, in Barcelona, Spain. A required tour of the music hall’s crescendo of colorful stained glass and mosaics is pricey but worth it, and you may even catch musicians practicing. (Courtney Bonnell via AP)