Phantom Guide

The Phantom Guide is a minor character in The Legend of Zelda: Ocarina of Time. He is a Poe who plays a role in the trials Link must face in the Haunted Wasteland. After Link crosses the "River of Sand", and follows the flag posts, he will reach a stone monument. If Link ventrues inside he will find a chamber that houses a Treasure Chest, but the real challenge is found atop the structure. If Link climbs the structure, he will find a stone plaque that reads "One with the eye of truth shall be guided to the Spirit Temple by an inviting ghost". If Link uses the Lens of Truth, he will be able to see the Phantom Guide. The Poe will show Link the true path to reaching the Desert Colossus, and if Link strays from the path, he will become lost and be transported back to the start of the Haunted Wasteland. Leevers attack Link while he following the Phantom Guide and this is meant to make him lose focus or lose sight of the guide. If Link follows the Phantom Guide perfectly, however, he will reach the Desert Colossus and the Spirit Temple. The guide will not take Link back in the reverse direction, and he will only help him reach the Deseert Colossus.

It is possible to memorize the Phantom Guide's path, and travel it without ever receiving help from the ghost, but this is near impossible to do, and hardly worth it.