See earlier post for Twitter recommendations.
Added: Photo by astronaut Douglas H Wheelock, taken last October:
A night view of the Nile River winding up through the Egyptian desert toward the Mediterranean Sea, and Cairo in the river delta. Such a stark contrast between the dark desolate lifeless desert of northern Africa and the Nile River teeming with life along its shores. In the distance... the eastern Mediterranean on a beautiful autumn evening.
Image copyright © Douglas H Wheelock, NASA.