Homeway

Homeway FT&S p36 4th-level conjuration Casting Time: 1 hour Range: Touch Components: V, S, M (two gold bracelets worth 250 gp each, which the spell consumes) Duration: Until dispelled As the casting of this spell is complete, one of the two bracelets used in its casting is placed on a door in a structure owned by the spell's caster, which then magically becomes a part of the door's architecture. This could take the form of the bracelet encircling a doorknob, becoming a door knocker, becoming a handle, or similar.
  At any time within the spell's duration, a creature holding the other bracelet can take an action to touch it to an adjacent closed door on the same plane as the other affected door, and can open the touched door as part of the same action. When that door is opened, it has a portal opened within its frame that exits out the other doorway first designated in the casting of this spell.
  This portal is one way, leading from the touched door to the first door within the structure. Both sides of this portal lead into the same room, and the creature that touches the second door decides which room on either side of the original door the portal opens into.
  After activating the second bracelet in this way, the spell lasts for 1 minute, after which it ends, the portal closes, and both bracelets crumble into dust.
  Classes: Artificer, Bard, Cleric, Druid, Ranger, Sorcerer, Warlock, Wizard Source: FT&S, page 36