I think only certain verbs work with the infinitive, such as see, hear, learn, find out, discover etc.
Those words also work the "in -ing" possibility.
Another possibility is "It is interesting to ..."
I'm interested in going to Russia. (focus is on me)
It would be interesting to go to Russia. (focus is more on the activity, but the fact that I'm speaking means that the interest is mine)
I think it would be interesting to go to Russia. (More explicitly my interest)
But not "I'm interested to go to Russia."