Archaeologists have uncovered a 1,600-year-old Mayan temple in the northern Guatemalan jungle. The Temple of the Night Sun used to be blood-red, making it visible for miles during dawn and dusk. It is decorated with 5-foot-tall stucco masks of the Mayan sun-god that depict him changing as he travels across the sky over the course of the day.

Researchers believe the temple was likely built between 350 and 400 AD to honor the founder of the first El Zotz dynasty, who is buried under the Diablo Pyramid. The Mayan civilization reached its height between 250 and 900 AD when they spread through southern Mexico, Guatemala, Honduras, El Salvador, and Belize.