Pool of Prophecy

The Pool of Prophecy was a small pond that was located in a jungle area in planet Tau Alpha C. The Pool enables anyone who looked into it to gain a glimpse of the future. As a result it was used by the Travelers as a test to recently "born" Travelers to see how they would react to the unique vision, and to test if they would use their powers to change the outcome. (TNG novel: A Time to Be Born).