Bone-Eater's Well

The Bone-Eater's Well (骨喰いの井戸,ほねくいのいど) is a well found in the shrine that Kagome lives at in the present day it is hidden inside one of the buildings of the shrine which is usually kept locked up. In the feudal age it is located in a small forest clearing the well is used to to dispose of bodies of demons and monsters but it also has the purpose off been used as a gateway between the present day and the feudal age. Humans are unable to pass through the well unless they have in their possession one of the shards of the Shikon no Tama although demons such as InuYasha or the Mistress Centipede do not require one of the shards to pass through.

Uses
In the InuYasha Franchise, The Bone-Eater's Well is a mystical well used initially to dispose of the bodies of demons and monsters, whom proved near unbeatable. (i.e. mistress centipede due to her constant resurrection) The Bone-Eater's well is a major aspect in the series due to it's ability to act as a portal between the past and the future. This is obviously invaluable to Kagome who transits via the Bone-Eater's well to go to the feudal era and back, (as well as Inuyasha. Although other demons can also travel through the well too, such as Mistress Centipede.

Known traveler of the Well
​The demoness's bone was sent to the future fifty years before the story start by Kikyo and her follower. She was able to resurrect herself thanks to Shikon no Tama and return to the past via the same well. ​Sounga was perhap the very first thing that travels through the bone eater well. The sword was sent to the future 250 years before the story along with Saiya.
 * Mistress Centipede
 * Kagome Hirugashi
 * Inuyasha
 * Sounga