Archaeologists think they may have found a secret, unknown civilisation in Central America.
They have spent six years digging around a site at El Cascal near the Atlantic coast of Nicaragua.
And in true Indiana Jones style, they have discovered lots of rare relics. That's what archaeologists call treasures they find, like bits of pottery, monuments and rock paintings.
Clues from the relics suggest the civilisation was there a long time before the famous Mayans, who lived from 2000BC to 100AD.