Chichen Itza - Yucatán, Mexico - Height: Varies (the pyramid is 30 meters) - Completion Year: Estimated to be around the 9th or 10th century - Construction Cost: Incalculable

Detail: Chichen Itza is a Maya pyramid renowned for its precise astronomical alignment and intricate carvings.

Interesting Fact: On the equinoxes, the sun casts a shadow that resembles a serpent descending the pyramid.