A perfect accessory and great learning tool for use with your telescope, binocular, or even unaided eyes (amazon.com)
Unfortunately, the Great Wall's composition of clay and stone simply blends in too much to the surrounding landscape for anyone to make it out with an unaided eye from orbit. (businessinsider.com)
See Colin's post above for more about what telescopes and microscopes can show us, as well as what can be seen by the unaided eye plus a properly functioning mind. (religion.blogs.cnn.com)