My first graders explored NASA. In our reading curriculum we read an informational text about astronauts and landing on the moon. The NASA collection allowed us to take a virtual field trip through NASA.
We also used the Ocean collection when we were reading about sea animals. This gave us a first hand perspective on the habitats that sea animals encounter on a daily basis. My first graders loved taking a dive under the water and staying dry at the same time.
If you are looking for a simple way to integrate technology into your K-2 classroom, Google Street View can be a great tool for breaking down your classroom walls.