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These two leaning towers are located in Madrid. The middle structure is not as tall as the twin towers. It is much closer to me and thus it seems they are equally huge.

Upper left

This is the Holy Family Cathedral in Barcelona. The church was designed by Gaudi, a very unconventional architect who like non-linear design. The project started in 1883 and would be finished in 2026.

Upper right

This is a scene in Toledo. The entire city is composed of forts and many historic buildings. When I walked around there, I felt like entering the world of "Lord of the ring"!