Don't get too excited, this isn't something that is possible in the real world... but in the world of fiction, using a portal, trans-dimensional gateway, rift in time and space, etc. can be as easy as walking through a door.
This infograhic, which was created by HomeAdvisor.com (the home remodeling folks), includes a huge number of these portals! Whether it's from a video game like portal, a book like Harry Potter, a television show like Stranger Things, or a movie like Wreck-It Ralph, this compendium has it all!
Infographic by: www.homeadvisor.com