The 1st book starts with the main character (Paul), a WWI soldier climbing a giant tree in the middle of the battlefield and finding a giants castle. Other episodes include Tik-Toks and Paul on (John Carter's) Mars.
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1The answer below is correct, but just wanted to add that it's not a trilogy but a quadrilogy – System Down Nov 22 '13 at 17:58
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2Tetralogy, to be pedantic, is the only correct term. – James McLeod Nov 24 '13 at 3:16
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The Otherland series by Tad Williams :-)
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I wouldn't bother. ;-) Weeell, it's ok, but about 4 times as long as it should be and half the characters could be dropped. – Grimm The Opiner Nov 25 '13 at 9:34
