The Palantiri were Stones of Seeing that were able to communicate with eachother over great distances. They enabled both sight and conversation. Elendil brought 7 Palantiri to Middle-Earth and they were used by the Kingdom of Gondor to guard the empire. Sauron got his hands on the Palantir of Minas Ithil and used it to corrupt Saruman who had the Palantir of Orthanc and Denethor who had the Palantir of Minas Tirith.
The End of the Complete Tour of Middle-Earth
"I am afraid that this was the last item on our topic list and so this is the end of the Complete Tour of Middle-earth. If you have followed the entire tour as I suggested it, then I must congratulate you. Your knowledge of Middle-earth must have grown substantialy. If there are any topics that you would like our webmaster to add, then please contact him. I am afraid that I am going home now, back to the Shire for a nice pipe-smoking session. What do you want to do?"
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