If you are a history or civics teacher, you should check out the Digital Public Library of America. Why? Because it's awesome!
The premise behind the DPLA is pretty awesome. You can explore over 5.5 million resources through their handy search bar; check out exhibitions about everything from activism to Boston sports and even parks and public spaces; explore the big cities of the US (the closest is Boston) through achieved reports and documents; and you can even explore the US via timeline to see what was going on in the US at any given time. The wealth of information is pretty awesome! And I haven't even mentioned the more than 1.5 million books accessible in the bookshelf or the apps available that have been crafted using the data they have.
Do you use the DPLA already? How do you, and your students, like it? Let me know!