This is Mexico City's version of the Empire State Building. It took eight years to complete; construction began in 1948 and ended in 1956. It has 44 floors and a TV-radio tower, and weighs 25,000 tons; its mass is held up by 361 concrete pylons. You can get a great view of the city from the skyscraper's observation decks or from the cafés on floors 42, 43, and 44. On your way back down, stop in at the cafeteria and the museum (your entry fee covers this as well), which provides information on the history of the building, on the 37th floor.