In C.S. Lewis's Chronicles of Narnia series, the children discover a wardrobe in an old professor's house that serves as a portal to the magical world of Narnia.

In J.K. Rowling's Harry Potter series, Platform 9 and 3/4 at King's Cross Station is the gateway to the wizarding world, accessible by running through a barrier between platforms 9 and 10.

In Rick Riordan's Percy Jackson series, the Half-Blood Tree is a magical portal that allows demigods to travel between the mortal world and Camp Half-Blood by touching its sap.

In Philip Pullman's His Dark Materials trilogy, Dust is a mysterious substance that allows individuals to travel between different worlds and is closely tied to the concept of consciousness.

In Madeleine L'Engle's Wrinkle in Time series, the Tesseract is a magical force that allows the Murry family to travel through time and space by folding space upon itself.

In Lloyd Alexander's Chronicles of Prydain series, the Black Cauldron is a magical artifact that can grant wishes but requires a terrible sacrifice in return.

In Eoin Colfer's Artemis Fowl series, the Opal Gateway is a magical portal that allows fairies to travel between their world and the human world.

In Angie Sage's Septimus Heap series, the Book of Gates is a magical book that allows the protagonist, Septimus Heap, to travel through time.

In Cornelia Funke's Inkheart series, the book titled 'Inkheart' has the magical ability to bring characters out of the pages and into the real world when read aloud.

In Jonathan Stroud's Bartimaeus Trilogy, the Amulet of Samarkand is a magical artifact that allows the protagonist, Nathaniel, to summon and control demons.

In Michelle Paver's Chronicles of Ancient Darkness series, the Nexus is a magical portal that allows the protagonist, Torak, to travel between different realms.

In Cassandra Clare and Holly Black's Magisterium series, the Magisterium is a magical school that trains young magicians and prepares them for their roles in the magical world.

In Jonathan Stroud's Lockwood & Co. series, Lockwood & Co. is a small agency run by three young ghost-hunters who investigate and resolve supernatural cases.

In Ransom Riggs's Miss Peregrine's Home for Peculiar Children series, the peculiar children are trapped in a time loop that repeats the same day over and over again.

In Jessica Townsend's Nevermoor series, Morrigan Crow is whisked away to the magical city of Nevermoor, where she discovers her true destiny and magical abilities.