Coursera offers other free courses from the nation's top schools, including "Greek and Roman Mythology" from the University of Pennsylvania, "Imagining other Earths" from Princeton, and "Child Nutrition and Cooking" from Stanford.
Class Central also offers nearly 500 courses from Ivy League schools for free online.
Explore.org, the world's largest live nature cam network, provides a large array of live streams to choose from, including a penguin beach in California, a sea lion beach in British Columbia, an elephant park in South Africa and dozens more. They even offer live streams of newborn puppies and rescued kittens, providing hours of adorable entertainment.
One of the best things America ever did was establish the national parks system, conserving the nation's ecological heritage and pristine wilderness for everyone to enjoy.
But, while visiting the parks is a family road trip classic, it's not exactly an inexpensive experience for many of us, not to mention how time consuming it can be.
Good news! You don't actually have to leave your couch to see some of America's most glorious landscapes. Powered by Google Earth, a whole bunch of parks offer free virtual tours.
Check out some of the highlights!