Livius.org - A great site on all things ancient
Mesopotamia
Mesopotamia at the British Museum
The Flood
Gilgamesh Tablet XI, the Flood Tablet
Biblical account of the flood (Genesis 6-9)
GILGAMESH
The Epic of Gilgamesh interactive site
Epic of Gilgamesh Full Text version 1
Epic of Gilgamesh Full Text version 2
Why is the Fertile Crescent largely a desert today?
Egypt
Aswan High Dam
Hieroglyphics, including a Hieroglyphic "translator"
TourEgypt - The Tut Collection
National Geographic Unraveling the Mysteries of Tutankhamun Explore each of the tabs.
The Seven Wonders
The UnMuseum - Seven Wonders of the Ancient World
CNN Travel Destination: The Seven Wonders of the Ancient World
And he're the Wikipedia article! (click on individual wonders for more)