Interesting that for virtually all the answers only the first part is required (i. e. "Statue" for statue of liberty; "Niagara" for Niagara Falls) but the entire "Pyramids of Giza" is required for the Pyramids.
Pyramids of Giza or Great Pyramid is required for that one because there are many, many more pyramids in other places. It would be wrong if Statue of Liberty required just statue, like you said, but that is in fact not true; you have to enter the whole thing. Also, I used official type-ins for almost all of these expect four, so I decided it was best not to change those.