Machu Picchu is a religious, astronomical, ceremonial and agricultural site consisting of approximately 200 structures, including temples, palaces, terraces, walls, monuments and more. Due to its wealth of structures, it can take hours to see everything, and there are a few that every visitor should see, such as the Sun Gate, or Inti Punku, especially at sunrise. Other must-see Machu Picchu sights include the Watchman’s Hut, which has a commanding view of the city; the Temple of the Sun, where you will find some of the citadel’s finest stone work; the Royal Tomb, or Palace of the Princess, which lies next to the Temple of the Sun; the Sacred Plaza, which includes the Temple of the Three Windows, the Principal Temple and the House of the High Priest; the House of Ornaments, considered the most beautiful building in the complex; and Intihuatana, a ritual stone that was used for astronomical observations and ceremonies.