Re: Sentence as a direct object and single indirect object.
That is a a giant noun phrase, not a sentence. "Places" is the heart of it. The rest just tell you which places.
Originally Posted by Mr.Lucky_One
I don't know what you mean about the "it." If it helps you to understand this, you could think of it as "Tell me information/a story about the places..."
And can an indirect object be without direct one?
Instance: "Tell me about places you visited while you were in China."
I see indirect object "me" but where is the direct one?
Actually, I can make assumption (though maybe strange assumption) that there is "it" after "me" in both instances but it's just omitted. But I am not quite sure about this.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.