Spain, Barcelona, the Arenas, an ancient plaza de toros (bullring) converted into shopping center by the architect Richard Rogers. †
Giuseppe Masci/© Giuseppe Masci
Giuseppe Masci/ age fotostock
Originally an early-20th-century bullfighting ring, the building fell into disuse after the final bout in 1977 and was converted into a shopping mall in 2010. Take the elevator or escalators to the rooftop terrace restaurants—the ideal spot for a drink with city views. Slightly improved views via the outdoor elevator come at a price, but the transparent landing can be accessed from the main rooftop for free.