Astronomical Observatory, reflecting the sun's rays and clouds. Machu Picchu has at least two structures that may have had astronomical importance. The first is a stone pillar that the Incas called "for tying the Sun," or "intihuatana." This pillar may have been associated with the winter solstice. The second structure of interest astronomically is a room known as the Torreon which may have been a primitive observatory. It includes a natural stone altar that is enclosed by a beautifully designed spiral wall, with windows of various shapes and sizes built into it.


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