This is the temple of the Three Windows is obvious because it has 3 windows. It only has three walls and used to have a roof.
It lead to speculation that Machu Picchu’s original name was Tampu-Tocco, the place where the first Inca was born. This is because of a story that the first Inca “ordered works to be executed at the place of his birth; consisting of a masonry wall with three windows, which were emblems of the house of his fathers whence he descended.” However Tampu-Tocco was supposed to be by lake Titicaca, and the temple of the three windows actually originally had 5 windows but the outer two were filled in. You can see one in the left of this picture.
The stones are irregular shapes, smoothed and fitted together, instead of rectangular blocks. Therefore it must have either been built earlier or been less important than the Temple of the Sun and the Main Temple.
This stone in front of the temple and its shadow form an Incan cross on the ground when the sun hits it just right.
