I am searching for a quite long time a movie that was about an English (I think) professor, or sort of researcher who knew word that can lean you to another universe. So no one believed him (of course) but in some way he found a way to open the portal.
The scene about the portal I remember quite well. It's him in a place like cave, reminds me of Grand Canyon, when he was saying the words (each sentence made sense in the situation) and he was jumping through the rocks or staying in one place depending on the "poem".
So he entered the word, and after that I don't really remember anything. It was kind of an action, Jackie Chan movie, the bad guys were ninjas, there were samurais with swords, they were teaching the professor how to be a warrior. There were actions in Chinese places and there were this beautiful woman (also chinese) which I think had love interest with the proffessor.
I know this is not much info, but please help me, I was really impressed by the movie when I was a kid. So I guess the movie is made definitely before 2006, maybe even before, I am not sure.