tower of the temple of the Sun is a semi-circular construction built over a
rock of pure granite with two trapezoid shaped windows.
Machu Picchu is a 15th-century Inca site
located in Cusco, Peru. It stands 2,430 m above sea-level, in the
middle of a tropical mountain forest, in an extraordinarily
beautiful setting. It was the most amazing urban creation of the
Machu Picchu was declared a UNESCO World Heritage Site in 1983. In 2007, Machu Picchu was voted one of the New Seven Wonders of the World in a worldwide Internet poll.
Machu Picchu was built in the classical Inca style, with polished dry-stone walls. Its three primary structures are the Inti Watana, the Temple of the Sun, and the Room of the Three Windows.
Wikipedia, Machu Picchu.