The ancients hid the secrets of their incredible knowledge of astronomy in their temples and palaces, built to align with the sun, on the same day, all over the world. Revealing our species' obsession with the sun, across thousands of years and every continent, this is architectural magic on a cosmic scale.

Chaco Canyon, located in northwest New Mexico, is perhaps the only site in the world constructed in an elaborate pattern that mirrors the yearly cycle of the sun and the 19-year cycle of the moon. How did an ancient civilization, with no known written language, arrange its buildings into a virtual celestial calendar, spanning an area roughly the size of Ireland?