LIMA (Reuters) - A ceremonial plaza built 5,500 years ago has been discovered in Peru, and archeologists involved in the dig said on Monday carbon dating shows it is one of the oldest structures ever found in the Americas.


A team of Peruvian and German archeologists uncovered the circular plaza, which was hidden beneath another piece of architecture at the ruins known as Sechin Bajo, in Casma, 229 miles north of Lima, the capital. Friezes depicting a warrior with a knife and trophies were found near the plaza.

"It's an impressive find; the scientific and archeology communities are very happy," said Cesar Perez, the scientist at Peru's National Institute of Culture who supervised the project. "This could redesign the history of the country."

Prior to the discovery at Sechin Bajo, archeologists considered the ancient Peruvian citadel of Caral to be one of the oldest in the Western Hemisphere, at about 5,000 years.

Scientists say Caral, located a few hours drive from Sechin Bajo, was one of six places in the world -- along with Mesopotamia, Egypt, China, India and Mesoamerica -- where humans started living in cities about 5,000 years ago.