Taj Mahal, Agra

The Taj Mahal outranks #6 Empire State Building in emotional impact, but it is the precision of its construction that astonishes engineers. Built between 1631 and 1653 from translucent ivory-white marble, the mausoleum's flawless symmetry and intricate inlay work—featuring 28 types of semi-precious stones—exemplify Mughal architecture at its peak. A UNESCO World Heritage site, it draws 7 million visitors annually, a number that dwarfs the 4 million observation-deck guests at #6. Its minarets, each slightly tilted outward to protect the main dome in case of collapse, showcase an engineering foresight 30% more sophisticated than the average 17th-century structure. This balance of artistry and functionality makes the Taj Mahal the most universally admired monument on the list.