The Earp homestead is the home of Wynonna and Waverly Earp as well as the past home of presumably all past Earps. The bedrock of the the homestead is made of ammolite, which prevents Revenants from coming onto the land. Sometime prior to Ward Earp's death, Waverly buried a talisman in the cemetery. This allowed revenants on the land, most notabley, The Seven.
Season 1 Edit
When we first see the homestead in Purgatory (episode), the house and it's surroundings are trashed. The revenant Malcolm Ramaker kidnaps Waverly and takes her to the homestead in order to steal Peacemaker. In the next episode, Keep the Home Fires Burning, the gang is able to locate the talisman that allows revenants on the land, and removes it. It's not until the episode Diggin' Up Bones that we see the property restored and the Earp sisters living there.