As it might be seen in 3D... from space! (HT: TimeandDate):
If you want to see how the Monday, 21 August 2017 eclipse might look from Earth, and more specifically, from any zip code in the United States, Time has an app for that! (HT: Mark Perry)
Update 26 August 2017: NASA has video of the Moon's shadow crossing across the Northern Hemisphere from multiple vantage points in space!