A view of the building (top) where archeologists found a burial chamber at the archeological site of Atzompa, in the Mexican state of Oaxaca, is seen in this undated handout photo released by the National Institute of Anthropology and History (INAH) July 18, 2012. REUTERS/INAH/Handout

A view of a burial chamber at the archeological site of Atzompa, in the Mexican state of Oaxaca is seen in this undated handout photo released by the National Institute of Anthropology and History (INAH) July 18, 2012. REUTERS/INAH/Handout

Glasses, a metate (mealing stone) and a sea shell fragment are seen at a burial chamber at the archeological site of Atzompa, in the Mexican state of Oaxaca in this undated handout photo released by the National Institute of Anthropology and History (INAH) on July 18, 2012. A funerary complex, consisting of three burial chambers, was discovered at the pre-Hispanic site of Atzompa in Oaxaca. The discovery of the complex, which is more than 1,100 years old, is important because it was located inside a building designed exclusively to house a series of tombs, which are placed vertically, one above another, and unlike the ones found so far, they are not underground, according to INAH. REUTERS/INAH/Handout

A jaguar gets shower in its enclosure at the Skopje Zoo on July 20, 2012. A heat wave swept across Macedonia with temperature reaching up to 40 Celsius (104 F). The high temperatures are expected to last for most July, local media reported. REUTERS/Ognen Teofilovski (MACEDONIA – Tags: ANIMALS ENVIRONMENT)