"At the astronomical observatory there is the Intiwatana, the curiously-shaped stone block believed to have been a solar clock or, “the hitching post to the sun”, where the sun rays cast shadows used for the planning of seasonal activities and religious ceremonies. What amazes architects today is the precision with which building stones were cut and assembled."
Machu Picchu.

Read about Machu Picchu.

Photos displayed with the kind permission of Katie Duran