The Zócalo (Plaza de la Constitución) is one of the largest squares in the world, built over the heart of Tenochtitlan. On its north side, the Metropolitan Cathedral took almost 250 years to build (1573 to 1813), mixing Renaissance, baroque and neoclassical styles. Look at how it leans because of the soft ground.
Price: free; bell tower tours small fee · Tip: watch the flag ceremony at 8:00 or 18:00.
