In what location did Clark reveal to Lois that he was Superman?

Question

I think it was at the hotel room at the hoover dam, but im not sure?

Answer 1

In Niagra falls after he trips and his hand falls into a fire pit, after that he shows her the fortess of solitude and at the end of the movie does some weird mind trick that erases her memory, that happens in superman II if your wondering

Answer 2

In a pink hotel suite near Niagara Falls.