Casa Batlló, Barcelona, Spain

Built in 1877 and restored by Antoni Gaudí and Josep Maria Jujol, the Casa Batlló is a perpetual Barcelona highlight and part of the Gaudí UNESCO World Heritage Site. Referred to by locals in Catalan as Casa dels ossos (House of Bones), the building’s exterior indeed has a remarkable skeletal appearance. The façade is made from broken ceramic tiles in hues of orange, green and blue. In his design, Gaudí was inspired by the shapes and colours found in marine life.