Great quiz, really enjoyed it! For me the trick was guessing a couple ones I thought would be there (Statue of Liberty, Pyramids) and calibrating based on that.
I do think maybe for St. Basil's could accept Red Square and the Kremlin, as they're essentially part of the same site.
Amazing quiz idea! Could I maybe suggest accepting several landmarks with essentially identical coordinates, though? For example, "Kremlin" and "Red Square" for St. Basil's as they are part of the same complex, and "Hagia Sophia" for Blue Mosque, as they are adjacent to one another.
Please accept "Brandenburger Gate" for "Brandenburg Gate" because not only is this how it is said in German, this also literally means the Gate of Brandenburg.
Fun concept, really tests your geographical intuition. It definitely needs the yellow box though, you could get most of these by just spamming landmarks. Also, a little more time would be good. And I think the last two are much less famous than the rest, leading me to not try them as I had dismissed them as not being noteworthy enough.
I do think maybe for St. Basil's could accept Red Square and the Kremlin, as they're essentially part of the same site.
Please accept "Brandenburger Gate" for "Brandenburg Gate" because not only is this how it is said in German, this also literally means the Gate of Brandenburg.