Today, on their Lat Long Blog, Google announced the addition of historical imagery of Berlin to Google Earth. The new imagery includes images from 1945 and 1953. For more historical imagery, turn on the Rumsey Historical Maps layer in Google Earth.

Applications for Education
Next week marks the 20th anniversary of the fall of the Berlin Wall. The historical imagery in Google Earth could be a good way to show students the changes in Berlin over the last 64 years.

Timelines.com has some good information about the fall of the Berlin Wall.

Here is a related item that may be of interest to you:
Touring the Remains of the Berlin Wall