The Chronicles of Narnia by C. S. Lewis
For more fantasy to make you believe magic is just through the nearest wardrobe, try these…
The Deptford Mice Trilogy by Robin Jarvis for more in utterly believable talking animals and a dark, dark fantasy world.
The Weirdstone of Brisingamen by Alan Garner for beautiful, hard-edged fantasy using British mythology.
The Immortals series by Tamora Pierce for characters you desperately want to be and a world packed with fantastical races and monsters.
The Redwall series by Brian Jacques for a truly epic fantasy series of good versus evil.