The Library

Pharos stood guard with a blazing light,
Guiding the triremes through Egypt's night.
While deep in the halls of the scholars' home,
Lay all the scrolls of Greece and Rome.
But fire consumes what the parchment saved,
And ancient shores were fiercely waved.
Now secrets sleep in the deep sea floor,
Where waves whisper myths forevermore.

What am i?