8. Torre Agbar
Torre Agbar or Agbar Tower is a 33-story building in Barcelona, Spain. Torre Agbar, which resembles a bullet in its shape, is not as famous as Gaudí’s buildings, but it is one of the most important architectural values of Barcelona. Designed by French architect Jean Nouvel, the 144-meter-high building is used as an office space. So it is not possible to visit the tower.