Pitkin County authorities said Monday evening that a climber was missing on Pyramid Peak — despite searchers finding a snow cave likely to have been used by the man. The Sheriff’s Office said it ...

Archaeologists are opening a cave sealed for more than 30 years deep beneath a Mexican pyramid to look for clues about the mysterious collapse of one of ancient civilization's largest cities.

Experts have long been studying and exploring Chichén Itzá, a major set of Maya ruins on the Yucatan Peninsula of Mexico that includes the impressive pyramid El Castillo. But, as The Associated Press ...