5. La Pedrera, Spain
La Pedrera building situated in the city of Barcelona in Spain. It took 6 years for the completion of this strange building starting in 1906. The Catalan architect Atoni Gaudi was the designer of this building, listed on UNESCO’s world heritage site.
The cave like balconies itself makes La Pedrera a strange looking building, have limestone facade. The roofs of this building decorated with pictures and postcards of Barcelona. The interior of the building also designed for bringing daylight, will also get stunning view of city from the top.