Disney California Adventure turns 20 this year. Here is a look back to March 2000. In this video you will see the Mickey and Friends parking structure which is nearing completion. Then some of the construction walls leading to the Monorail Station. From there can see Downtown Disney and Grand Californian Hotel work. Finally we board a Disneyland Monorail that is operating in shuttle model (it backs into the station then returns to the park the same path). From the Monorail you can see the entrance for Disney California Adventure taking shape.
Here are some stills from the video: