New York City might not be the capital of the world but it does a good job of melting its many peoples & cultures into an ever-changing & thriving urban metropolis, financial epicenter, creativity incubator & bastion of American street life.
The Zócalo is the world's 2nd largest square. Built atop the ruins of the Aztec capital's majestic main temple it is surrounded by important buildings including: the National Palace, the Supreme Court of Justice and the National Cathedral.
Chicago is the 3rd largest city in the USA. Its Lake Michigan shoreline and spiked glass-and-metal downtown skyline is considered by many the most picturesque skyline in the world.