Psychedelics, meditation and mental illness show you or change the contents of the house - but you can never leave the house of the existence of consciousness. The closest thing we have to that would be death, and even then you only know if consciousness disappears if you die.

In fact, you would not even experience the disappearance of consciousness - because the consciousness that would experience this has disappeared. It is impossible to experience the absence of consciousness.

They are reputed to be able to pop the delusion of omniscience that accompanies standard consciousness as well.