This is big: Library of Alexandria discovered.

Archaeologists have found what they believe to be the site of the Library of Alexandria, often described as the world’s first major seat of learning.

 

A Polish-Egyptian team has excavated parts of the Bruchion region of the Mediterranean city and discovered what look like lecture halls or auditoria.

One of the greatest losses of antiquity. For more background, Wikipedia has a really good entry on the Library of Alexandria.