Pentagon Conspiracy?

Various conspiracy sites like The Power Hour and others have posted articles claiming that the reports of a Boeing 757 crashing into the Pentagon on September 11, 2001 are false. If the photos they have posted are accurate, then there seems to be at least one compelling question: Where is the airplane wreckage? The shots they show have lots of fire engines, burning and blackened building facade, and clear structural damage to the Pentagon, but they don't have any big aircraft pieces.

Abovetopsecret.com, refutes the claims, and shows how the crashed plane was rendered into component sized pieces. This would seem to make sense, as the plane crashed into a solid, 1940s era concrete structure. The proverbial "immovable object".

You can decide which argument you prefer.