Google Earth
Here is how to navigate around Google Earth. Below it is a video showing you how to place a marker for a site. I will be having a series of video so you can use this tool with your students. One use might be to follow the explorers in the Age of Exploration and both follow them on the earth, as well as embed pictures of the people and the places as they look today. The very top video tells you how to embed it in a blog.