The Russo Lair is a secretive magical room that replaces the closet inside the kitchen of Waverly's Substation whenever the Russos want to go there. It is from Disney's TV show, Wizards of Waverly Place.
It is where Jerry teaches Jerry teaches Justin, Alex and Max wizardry. Through the portal, they can go visit the wizard world. Wizards can also visit the Russos via teleportation.