The collapse of this civilization, known for perfecting a calendar ... explains why human activity in large urban centers like Tikal, Yaxha or Uaxactun could end in the 9th century, yet continued ...

Art and architecture were important too. This is the ancient city of Tikal. 1300 years ago it would have been called 'Yax Mutal' and was home to thousands of Maya people. Image caption ...

The urbanized lowlands of the Yucatan peninsula, including Tikal, deteriorated from thriving ... was the final straw that caused a brilliant civilization to disintegrate - and it was a calamity ...

Have archaeologists already discovered all of the major ancient Maya monuments—or is there still much more to be found?