What is the endless basement?

The endless basement runs underneath our world with access points in many locations around the globe.  (I have located several access points. One such access point connects to a staircase in an impossibly tiny cottage.  Another access point was found behind a wooden crate inside a very old barn.)

I stumbled into the endless basement through a dream and have explored many of its rooms and corridors. (One small room contained a very ancient and dusty roll-top desk as well as a multitude of old and equally dusty office supplies.  I once opened a closet that contained nothing but dolls from floor to ceiling. *I suspect that there is a passageway behind the dolls, but did not take it upon myself to move them.)

I know there are others like me, who have stumbled upon the endless basement.  I hope that with their cooperation we may begin to document this fascinating place.