SOLVED. Adult/ YA Fantasy series. Scientist invents a machine that allows to travel to fictional worlds. He goes on several trips with two friends. [s]

[Nevena]

First one is Norse mythology world, second one is the world of a Coleridge's poem Kubla Khan and the third is irish mythology worldIn all of these worlds technology doesn't work, but magic does. There are three basic magic laws- the law of similarity, the law of contagion and I don't remember the third one. In every world they have to fulfill a task that somehow changes the original story, so they can come back to our world. In the second or third story one of them finds a girl that he marries and takes back with him. I read the book two-three years ago, but I believe it is written quite a bit earlier.

[Genesistrine]

This is the Harold Shea series by L Sprague de Camp and Fletcher Pratt. The first book is The Incompleat Enchanter.

[Nevena]

that's it!!!

Thank you very much !

[Genesistrine]

Glad to help!