Mayan Ruins in Chichen Itza and Coba   They were once covered in a smooth shell of painted plaster. structure at one end of the ball courts at Chichen Itza outside of ball courts at Chichen Itza jungle of Coba view from the top of El Castillo in Coba sacred cenote at Chichen Itza 'The Nunery' at Chichen Itza Mayan observatory in Coba Mayan ball court in Coba inside the ball courts at Chichen Itza El Castillo in Chichen Itza jungle of Coba view from base of El Castillo in Coba observatory at Chichen Itza detail near 'The Nunery' in Chichen Itza cenote in Coba Mayan ruin in Coba inside the ball courts at Chichen Itza Mayan ruins in Chichen Itza El Castillo in Coba sacred cenote at Chichen Itza Mayan ruins in Chichen Itza Mayan ruins in Chichen Itza Mayan ruin in Coba Laura in Coba