I have a Mac Pro computer and a 30" cinema display. Where is the camera so I can Skype?

Here's my computer info:

Model Name: Mac Pro

Model Identifier: MacPro3,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.8 GHz

Number Of Processors: 2

Total Number Of Cores: 8

My Monitor info:

Displays: 30"

Cinema HD:

Resolution: 2560 x 1600

Pixel Depth: 32-Bit Color (ARGB8888)

Display Serial Number: CY8081S1XMP

I can't fin anything to turn on a camera. I thought these things had built-in features like this. I want to Skype but can't figure out how. WHat should I look for or how do I resolve my dilema?

Dan