Could you look at the sentences below?
1. I'm looking forward to going to New York this winter.
2. I'm looking forward to go to New York this winter.
I know #1 is grammatically correct because to in this case is a preposition, which is normally followed by a noun/ nouns.
However, is this rule strictly observed? I sometimes see a sentenhce like #2, in which to is followed by an infinitive.
The second version is grammatically incorrect