I just want some insight as to how this was created:
Specifically, in this demo when you click on the first picture it goes onto another gallery. And then when you click on a picture there it pops up in a lightbox. I'm wondering how the first page was configured (because if you create it as a gallery or portfolio item, it will just open up a portfolio item or open up a lightbox, respectively).
What we want instead is the 3-tiered behavior that's demonstrated in the demo link.