The Torre Latinoamericana was Latin America’s tallest building when constructed in 1956, and thanks to the deep-seated pylons that anchor the building, it has withstood several major earthquakes, including those of 1985 and 2017. Views from the 44th-floor observation deck and the 41st-floor lounge bar are spectacular, smog permitting.
You're free to leave and return the same day – useful to get views both by day and, perhaps more spectacular, night. Admission includes access to an on-site museum that chronicles Mexico City's history. Admission is free if you're just visiting the bar.