Llullaillaco

Llullaillaco is a dormant stratovolcano on the Argentina-Chile border (Salta Province) (Antofagasta Region). It is located in the Puna de Atacama, an area of high volcanic peaks on a high plateau near the Atacama Desert, one of the world's driest regions. After Ojos del Salado, it is the world's second highest active volcano.

Dacitic lava flows formed Llullaillaco in two periods during the Pleistocene-Holocene period. About 1.5 million years ago, the oldest rocks were formed.The volcano's southeastern slope fell about 150,000 years ago, causing a debris avalanche that extended as far as 25 kilometers (16 miles) from the peak. The summit region's youngest dated rocks were erupted 5,600 250 years ago, however there are accounts of activity dating back to the 19th century.

The first recorded climb of the mountain occurred in 1950, but indications of previous climbs and a number of archeological sites have been discovered on the peak and at its base; Llullaillaco is the world's highest archeological site. The Youngsters of Llullaillaco, or mummified bones of three children, were discovered at its top in 1999. It's assumed that they were human sacrifices. Mice have been seen on the summit area, which is the highest finding of mammal on the planet.

Location: Argentina–Chile
Elevation: 22,110 feet