Wormhole

Wormholes are special portals or tunnels created to get from one place to another place in an extremly fast way. Most wormholes in the universe were created by the Bifrost.

Thor
Thor and other Asgardians used the Buifrost to make wormholes to other places. Jane Foster was researching wormholes and studued the poissibilty of them.

Captain America: The First Avenger
After Red Skull held the Tesseract he seemed to be transported by a wormhole.