There's a good aeriel photograph of the Black Pyramid of Amenemhat III at Dashur on the above address. Here's the caption:
Aerial view of the pyramid of Amenemhat III at Dashur. Called the Black Pyramid because of its dark color, it was built in the Middle Kingdom, and the interior contains a complex system of tunnels and chambers. Due to the removal of the outer limestone casing, the pyramid has fallen into ruin.
There's a summary of what is known about the pyramid at the same site.