Going over the List of Confirmed Features (again), I stumbled over the Barringer Crater as a natural wonder. Why the Barringer Crater? Why not, if you're in Arizona, pick the Grand Canyon? And how does a Crater add two production?
I personally think the grand canyon is amazing (hiked it, camped at the bottom, been to havasupai repeatedly, love it) but I'm not sure I'd classify it as a natural wonder - it's just a big and spectacular canyon. There are similar "grand canyons" elsewhere in the world, like in Mexico. Another thing is, if you were to have stumbled upon the Grand Canyon early, you probably wouldn't realize its extent immediately - it covers such a large distance as an overall package. Plus, there's other "crazy" terrain and park-worth areas all over this part of the country (zion, bryce, sedona, painted desert, etc) so the GC doesn't necessarily stand out that much given the context.
What's funny is I've been in AZ for 20+ years and lived 40 miles away from the crater for 10+ years and never heard it referred to as "Barringer Crater" (had to wiki it) - it's just called "Meteor Crater" here. And I never found it interesting enough to visit since I find the more natural wonders here like GC, painted desert, etc to be more worthy.
Anyways, I expect that as an ancient explorer, find something like a monster-sized meteor crater would be a little more shocking than finding a big canyon, since canyons are essentially natural and a perfectly in-tact and huge meteor crater is very unnatural. A meteor impact like Barringer (it's a very perfect crater in the middle of nowhere) would definitely stand out.
Ultimately it's a game and who cares (what I always say). The devs probably wanted to put in a few things that were slightly different instead of wearing out the same old same old, kinda like how they mix up wonders every time thru.